redwoodn.¹

Brit.

/ˈrɛdwʊd/, U.S.

/ˈrɛdˌwʊd/

Forms: see red adj. and n. and wood n.¹

Origin: Formed within English, by compounding. Etymons: red adj., wood n.¹

Etymology: < red adj. + wood n.¹

1. The reddish wood of any of numerous trees; esp. (in early use) brazil wood or other tropical dyewood; (in later use) timber obtained from the California redwood, Sequoia sempervirens (see sense 2) or the Scots pine, Pinus sylvestris (= red deal n. at red adj. and n. Compounds 1e(d)). Frequently with distinguishing word.

ΘΚΠ

society > occupation and work > materials > raw material > wood > [noun] > woods of specific colour or dye-woods

red sandalwood?c1510

redwooda1533

whitewood1562

red sanderswood1598

sapan wood1598

peach woodc1638

Campeachy wood1652

coral-wood1693

Nicaragua wood1696

cam-wood1699

Guinea wood1722

Nicaragua1756

barwood1788

ruby wood1843

sap pan1874

the world > matter > colour > named colours > red or redness > red colouring matter > [noun] > dyes and dyestuffs

madderOE

grain1335

alkanet1343

Brazilc1386

crop-maddera1399

red-scarletc1400

alcanna?a1425

lac?c1425

madder root?c1450

incarnationa1475

jarecork1483

orchil1483

mull1507

orcanet1548

Bristol-red1551

red sanders1553

cochineal1582

safflower1583

chay1588

Pernambuco1595

red sanderswood1598

redwood1634

peach woodc1638

scarlet1653

mesteque1667

bow-dye1676

sylvester1697

corkir1703

gamene1703

orchilla1703

crap1721

saffranon1731

kino1788

Turkey red1789

lizary1791

granilla1812

munjeet1813

rubiate1835

orcein1838

purpurin1839

ruby wood1843

sassafrid1852

aal1853

pink salt1853

magenta1860

fuchsine1865

paeonin1865

safranine1868

corallin1873

marina1874

Magdala red1875

alizarin1878

eosin1879

Turkey red oil1879

roccelline1880

ponceau1885

amarant1888

phloxine1890

hypernic1897

Turkish red1900

Lithol red1930

a1533 Ld. Berners tr. A. de Guevara Golden Bk. M. Aurelius (1535) xlviii. f. 93 It was closed with two leaues, subtilly wrought of a reed wood [Fr. d'un bois rouge], that some sayd was of y^e tree that the Phenyx bredeth in.

1596 W. Raleigh Discoverie Guiana (new ed.) 63 They wore large coates, and hats of crimson colour, which colour he expressed, by shewing a peece of red wood, wherewith my tent was supported.

1598 W. Phillip tr. J. H. van Linschoten Disc. Voy. E. & W. Indies 199/2 They paint theyr bodies redde, with a colour made of redde wood.

1634 Copy Court Roll (Wakefield) One milne..used for the grinding of red wood.

1697 W. Dampier New Voy. around World v. 115 At this place I saw 3 or 4 Tun of the Red-wood, which I take to be that sort of Wood, call'd in Jamaica Blood-wood, or Nicaragua-wood.

1708 P. Gordon Geogr. Anatomiz'd (ed. 5) ii. 390 The chief Commodities of this Country, are Red wood (otherways Brasil-Wood, much us'd for Dying) in great Quantities abundance of Sugar, [etc.].

1725 H. Sloane Voy. Islands II. 185 Red-wood. This is very red, more porous, lax, and lighter than any of the foregoing woods.

1790 W. Nicholson tr. A.-F. de Fourcroy Elements Nat. Hist. & Chem. (new ed.) III. xviii. 76 Bastard rocket, madder, logwood, redwood, and Brasil wood afford yellow or red colours of this sort.

1812 J. Smyth Pract. of Customs ii. 237 Cam Wood, a fine red wood of Africa and of the Brazils, principally used in turnery... Cam Wood and Red Wood are considered in London as one and the same article.

1862 J. R. Jackson Technologist 271 The wood called Andaman Red wood is furnished by Pterocarpus marsupium.

1913 Sat. Evening Post (Philadelphia) 22 Feb. 66/1 (advt.) Made of California Redwood, covered with asbestos and galvanized iron.

1940 Railroad Mag. Apr. 63/1 Ties were split redwood but looked like sawed ties.

1991 Omni Mar. 62/3 They had a big platform made out of polished redwood.

2005 Plenty Mar. 41/1 All the furniture is handcrafted..using a local dark redwood called guapinol.

2. Any of various trees with reddish wood; (in later use) esp. (more fully California redwood, coast redwood) the very large, long-lived conifer Sequoia sempervirens, native to coastal areas of northern California and Oregon.

ΘΚΠ

the world > plants > particular plants > cultivated or valued plants > particular timber trees or shrubs > [noun] > names applied to various types of trees or shrubs

whitewood1562

yellowwood1583

lightwood1597

redwood1693

hoop-wood1756

stave-wood1778

whistle-wood1825

whip-cropa1850

pepperwood1858

white tree1863

the world > plants > particular plants > cultivated or valued plants > particular timber trees or shrubs > non-British timber trees > [noun] > North American

arrowwood1578

white pine1682

wicopy1704

American olive1772

pumpkin pine1809

mountain mahogany1810

redwood1819

western yellow pine1857

western hemlock1867

western red cedar1874

Sitka cedar1875

ponderosa1878

walking stick1910

1693 Philos. Trans. (Royal Soc.) 17 687 Thapangam, call'd by the Dutch Rasphout, not unlike the Red Wood of Brasil in all its parts.

1716 Petiveriana iii. 4/1 Red Wood [of Barbadoes].

1756 P. Browne Civil & Nat. Hist. Jamaica ii. ii. 278 Red-wood, or Iron-wood... This is a small, but a beautiful tree.

1819 D. B. Warden Statist., Polit. & Hist. Acct. U.S. III. 97 In the lower parts are found oak, elm,..red-wood, sumach.

1850 B. Taylor Eldorado I. vii. 47 A few miles west of the Pueblo there is a large forest of redwood, or Californian cypress.

1883 Harper's Mag. Jan. 210/2 When the glade began to narrow into a cañon the redwoods appeared—magnificent specimens..rising straight two hundred feet.

1905 H. W. Felter & J. U. Lloyd King's Amer. Dispensatory (ed. 19) I. 318 Soymida febrifuga..is the Rohuna or Rohun tree of Hindustan, and is known on the Coromandel coast of India as Redwood tree, and is the only known species of the genus.

1947 Life 17 Nov. 142/2 The rest of the day is spent in the composition of..a speech to stir up interest in the preservation of the California redwoods.

1968 R. Kroetsch Alberta iii. 85 The higher lands were lush with palms, sycamores, redwoods, fig trees, and magnolias.

2006 New Yorker 9 Oct. 32/1 The coast redwood, or Sequoia sempervirens, which is most often simply called the redwood, is a massive conifer.

†3. Scottish. = heartwood n. 2. Obsolete. rare.Apparently only attested in dictionaries or glossaries.

ΘΚΠ

society > occupation and work > materials > raw material > wood > [noun] > wood from specific part of tree

heartwood?1575

wood1600

alburnum1664

whitewood1668

sap-wood1791

redwood1825

1825 J. Jamieson Etymol. Dict. Sc. Lang. Suppl. Red-Wood, the name given to the reddish, or dark-coloured, and more incorruptible, wood found in the heart of trees.

4. Reaction or compression wood, esp. in gymnospermous trees.

ΘΚΠ

the world > plants > part of plant > part of tree or woody plant > wood > [noun] > juvenile or reaction wood

redwood1916

tension wood1924

compression wood1925

reaction wood1948

juvenile wood1956

1916 Forest Q. 14 500 Hence one may speak of ‘tension wood’ and ‘compression wood’, or according to the color (when fresh) of ‘white wood’ and ‘red wood’.

1925 Spiral Tracheids & Fiber-Tracheids: Trop. Woods (Yale Univ. Sch. of Forestry) 12 In so-called compression wood or ‘red’ wood (rotholz), found in both the Angiospermae and Gymnospermae, the cells have a thick laminated secondary wall, slit into a large number of closely compressed spiral lamellae.

2000 W. C. Dickison Integrative Plant Anat. xii. 407 The reaction wood of gymnosperms forms on the lower or compression side of the woody cylinder and is commonly known as compression wood, otherwise called redwood.

Compounds

General attributive, as redwood bark, redwood lumber, redwood tree, etc.

ΚΠ

1744 W. Smith's New Voy. Guinea 160 The Redwood Tree, so call'd by the Europeans, is also very large.

1745 P. Thomas True Jrnl. Voy. South-Seas 168 There are several others [trees] among which is one we call'd the Red-Wood-Tree, or Iron-Wood, from its great solidity.

1825 ‘J. Nicholson’ Operative Mechanic 84 The arms are of redwood fir, 6 inches square.

1883 Harper's Mag. July 815/2 Extensive yards of the attractive redwood lumber.

1885 B. Harte Maruja ii. 21 A quaint stockade..thatched with red-wood bark.

1913 Times 31 Dec. 4/5 In its best stands the redwood tree will average anywhere from 225ft. to 350ft. in height.

1938 Amer. Home June 28/2 White siding walls ship-lapped in cedar on the first story and contrastingly laid with flush redwood sheathing on the upper story.

1961 W. P. Keller Canada's Wild Glory iii. 107 Driving up from California to the north-west, I had revelled in the splendour of the mighty redwood groves along the highway.

2006 Gold Coast Sun (Austral.) (Nexis) 6 Dec. 42 The villas also use corrugated iron, eco-ply plywood and polished redwood floors.

This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022).

Redwoodn.²adj.²

Brit.

/ˈrɛdwʊd/, U.S.

/ˈrɛdˌwʊd/

Origin: From a proper name. Etymon: proper name Redwood.

Etymology: < the name of Sir Thomas Boverton Redwood (1846–1919), English chemist, who designed this type of viscometer.The first of these viscometers was described in 1886 (see quot. 1886 for Redwood viscometer n. at sense A. 1a), the second in 1913 or earlier ( B. Redwood Petroleum (ed. 3, 1913) II. ix. 277).

A. n.²

a. Redwood viscometer n. (also Redwood's viscometer) either of two types of viscometer (differing in the ranges of viscosity for which they are suitable), used chiefly to measure the viscosity of petroleum and its products.

ΘΚΠ

the world > matter > constitution of matter > density or solidity > viscosity > [noun] > specifically in scientific use > measurement of > instrument

viscosimeter1868

viscometer1883

Saybolt viscometer1886

Redwood viscometer1896

Saybolt1904

1886 Jrnl. Soc. Chem. Industry 29 Mar. 131/1 He had been in the habit of using one of Mr. Redwood's instruments for determining viscosities.]

1896 B. Redwood Treat. Petroleum II. ix. 605 The Redwood viscometer..is a modification, designed by the author in 1885, of the instrument formerly used at the Battersea Works of Price's Patent Candle Company.

1912 Proc. Royal Soc. A. 87 157 The viscosity of the oil was measured with a Redwood's viscometer at intervals of 5° F.

1931 G. Barr Monogr. Viscometry iv. 96 Liquids for which the Redwood No. II viscometer is specified..are difficult to free from suspended impurities.

1972 Harker & Allen Fuel Sci. vii. 98 The two standard instruments are the No. 1 and the No. 2 Redwood viscometers. The former is used for thin oils having viscosities of less than 2,000 Redwood seconds, and the latter for more viscous oils.

1985 Jrnl. Agric. & Food Chem. 33 1228/1 Viscosity of the starch and starch-surfactant complex solutions..was determined by the ISI procedure using Redwood viscometer No. 1.

b. Redwood second n. a measure of viscosity used in conjunction with a Redwood viscometer and equal to one second of the time required for a given quantity of fluid to pass through a capillary in the instrument; cf. sense B.

ΘΚΠ

the world > matter > constitution of matter > density or solidity > viscosity > [noun] > specifically in scientific use > measurement of > unit

Saybolt viscometer1886

Redwood unit1912

Saybolt viscosity1912

Redwood second1922

1922 A. R. Leask Marine Engines xi. 263 Redwood second readings, divided by 500, give Michell absolute readings.

1949 A. C. Merrington Viscometry v. 57 The results are normally expressed as ‘Redwood seconds’ at the temperature of the test.

1990 W. A. Livesey GCSE Motor Vehicle Stud. vii. 63/1 Viscosity..is calculated by timing how long it takes a set quantity of oil to flow through a tube of fixed diameter. The time is given in Redwood seconds.

2003 A. Hebra Measure for Measure xii. 164 Saybolt seconds, Redwood seconds, and the like are not true units of viscosity, but a measure of viscosity.

2. Used chiefly attributively with reference to measurements made according to a scale of Redwood seconds; esp. in Redwood time, Redwood unit, Redwood viscosity, etc.

ΘΚΠ

the world > matter > constitution of matter > density or solidity > viscosity > [noun] > specifically in scientific use > measurement of > unit

Saybolt viscometer1886

Redwood unit1912

Saybolt viscosity1912

Redwood second1922

1912 Proc. Royal Soc. A. 87 158 If we wish to obtain a criterion as to whether the first or second law should..be applicable to a fluid for which Redwood's viscosity is known, we have the equations (1).

1913 Petroleum World June 272/1 The remaining three columns respectively give their colour, density at 20° C. and viscosity at 20° in Redwood units.

1919 Jrnl. Industr. & Engin. Chem. 11 155/1 Mineral oils..of pale color and low viscosity ranging from 100 to 200 sec., Redwood Standard, at a temperature of 200° F.

1949 A. C. Merrington Viscometry v. 57 A Redwood time of T_R seconds.

1967 A. S. Brunjes in Bland & Davidson Petroleum Processing Handbk. xii. 32 The Kinematic, Saybolt, Universal, redwood [sic] No. 1, and Engler scales.

1983 Buck & Hickman Catal. 1983–5 724/2 The BQ10 is..capable of dealing with heavy viscosity oils up to 600 Redwoods No 1.

B. adj.²

As postmodifier. Designating the time in seconds for a liquid to pass through a capillary in a Redwood viscometer; cf. sense A. 1b.

ΘΚΠ

the world > matter > constitution of matter > density or solidity > viscosity > [adjective] > relating to measurement of viscosity

viscosimetric1895

Redwood1930

viscometric1938

1930 Engineering 5 Sept. 308/1 The fuel used throughout this test was Mexican boiler oil with..a viscosity of 200 secs. Redwood.

1973 J. G. C. Pope in Hobson & Pohl Mod. Petroleum Technol. (ed. 4) xviii. 654 The viscosity of relatively mobile oils is recorded as so many seconds Redwood I @ 100° F.

2003 A. R. Day et al. Heating Syst. iii. 101 Grade ‘D’ fuel oil is sometimes referred to as ‘35 sec oil’, which relates to a former specification of its viscosity as 35 seconds Redwood.

This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022).

单词	redwood
释义	redwoodn.¹ Brit. /ˈrɛdwʊd/, U.S. /ˈrɛdˌwʊd/ Forms: see red adj. and n. and wood n.¹ Origin: Formed within English, by compounding. Etymons: red adj., wood n.¹ Etymology: < red adj. + wood n.¹ 1. The reddish wood of any of numerous trees; esp. (in early use) brazil wood or other tropical dyewood; (in later use) timber obtained from the California redwood, Sequoia sempervirens (see sense 2) or the Scots pine, Pinus sylvestris (= red deal n. at red adj. and n. Compounds 1e(d)). Frequently with distinguishing word. ΘΚΠ society > occupation and work > materials > raw material > wood > [noun] > woods of specific colour or dye-woods red sandalwood?c1510 redwooda1533 whitewood1562 red sanderswood1598 sapan wood1598 peach woodc1638 Campeachy wood1652 coral-wood1693 Nicaragua wood1696 cam-wood1699 Guinea wood1722 Nicaragua1756 barwood1788 ruby wood1843 sap pan1874 the world > matter > colour > named colours > red or redness > red colouring matter > [noun] > dyes and dyestuffs madderOE grain1335 alkanet1343 Brazilc1386 crop-maddera1399 red-scarletc1400 alcanna?a1425 lac?c1425 madder root?c1450 incarnationa1475 jarecork1483 orchil1483 mull1507 orcanet1548 Bristol-red1551 red sanders1553 cochineal1582 safflower1583 chay1588 Pernambuco1595 red sanderswood1598 redwood1634 peach woodc1638 scarlet1653 mesteque1667 bow-dye1676 sylvester1697 corkir1703 gamene1703 orchilla1703 crap1721 saffranon1731 kino1788 Turkey red1789 lizary1791 granilla1812 munjeet1813 rubiate1835 orcein1838 purpurin1839 ruby wood1843 sassafrid1852 aal1853 pink salt1853 magenta1860 fuchsine1865 paeonin1865 safranine1868 corallin1873 marina1874 Magdala red1875 alizarin1878 eosin1879 Turkey red oil1879 roccelline1880 ponceau1885 amarant1888 phloxine1890 hypernic1897 Turkish red1900 Lithol red1930 a1533 Ld. Berners tr. A. de Guevara Golden Bk. M. Aurelius (1535) xlviii. f. 93 It was closed with two leaues, subtilly wrought of a reed wood [Fr. d'un bois rouge], that some sayd was of y^e tree that the Phenyx bredeth in. 1596 W. Raleigh Discoverie Guiana (new ed.) 63 They wore large coates, and hats of crimson colour, which colour he expressed, by shewing a peece of red wood, wherewith my tent was supported. 1598 W. Phillip tr. J. H. van Linschoten Disc. Voy. E. & W. Indies 199/2 They paint theyr bodies redde, with a colour made of redde wood. 1634 Copy Court Roll (Wakefield) One milne..used for the grinding of red wood. 1697 W. Dampier New Voy. around World v. 115 At this place I saw 3 or 4 Tun of the Red-wood, which I take to be that sort of Wood, call'd in Jamaica Blood-wood, or Nicaragua-wood. 1708 P. Gordon Geogr. Anatomiz'd (ed. 5) ii. 390 The chief Commodities of this Country, are Red wood (otherways Brasil-Wood, much us'd for Dying) in great Quantities abundance of Sugar, [etc.]. 1725 H. Sloane Voy. Islands II. 185 Red-wood. This is very red, more porous, lax, and lighter than any of the foregoing woods. 1790 W. Nicholson tr. A.-F. de Fourcroy Elements Nat. Hist. & Chem. (new ed.) III. xviii. 76 Bastard rocket, madder, logwood, redwood, and Brasil wood afford yellow or red colours of this sort. 1812 J. Smyth Pract. of Customs ii. 237 Cam Wood, a fine red wood of Africa and of the Brazils, principally used in turnery... Cam Wood and Red Wood are considered in London as one and the same article. 1862 J. R. Jackson Technologist 271 The wood called Andaman Red wood is furnished by Pterocarpus marsupium. 1913 Sat. Evening Post (Philadelphia) 22 Feb. 66/1 (advt.) Made of California Redwood, covered with asbestos and galvanized iron. 1940 Railroad Mag. Apr. 63/1 Ties were split redwood but looked like sawed ties. 1991 Omni Mar. 62/3 They had a big platform made out of polished redwood. 2005 Plenty Mar. 41/1 All the furniture is handcrafted..using a local dark redwood called guapinol. 2. Any of various trees with reddish wood; (in later use) esp. (more fully California redwood, coast redwood) the very large, long-lived conifer Sequoia sempervirens, native to coastal areas of northern California and Oregon. ΘΚΠ the world > plants > particular plants > cultivated or valued plants > particular timber trees or shrubs > [noun] > names applied to various types of trees or shrubs whitewood1562 yellowwood1583 lightwood1597 redwood1693 hoop-wood1756 stave-wood1778 whistle-wood1825 whip-cropa1850 pepperwood1858 white tree1863 the world > plants > particular plants > cultivated or valued plants > particular timber trees or shrubs > non-British timber trees > [noun] > North American arrowwood1578 white pine1682 wicopy1704 American olive1772 pumpkin pine1809 mountain mahogany1810 redwood1819 western yellow pine1857 western hemlock1867 western red cedar1874 Sitka cedar1875 ponderosa1878 walking stick1910 1693 Philos. Trans. (Royal Soc.) 17 687 Thapangam, call'd by the Dutch Rasphout, not unlike the Red Wood of Brasil in all its parts. 1716 Petiveriana iii. 4/1 Red Wood [of Barbadoes]. 1756 P. Browne Civil & Nat. Hist. Jamaica ii. ii. 278 Red-wood, or Iron-wood... This is a small, but a beautiful tree. 1819 D. B. Warden Statist., Polit. & Hist. Acct. U.S. III. 97 In the lower parts are found oak, elm,..red-wood, sumach. 1850 B. Taylor Eldorado I. vii. 47 A few miles west of the Pueblo there is a large forest of redwood, or Californian cypress. 1883 Harper's Mag. Jan. 210/2 When the glade began to narrow into a cañon the redwoods appeared—magnificent specimens..rising straight two hundred feet. 1905 H. W. Felter & J. U. Lloyd King's Amer. Dispensatory (ed. 19) I. 318 Soymida febrifuga..is the Rohuna or Rohun tree of Hindustan, and is known on the Coromandel coast of India as Redwood tree, and is the only known species of the genus. 1947 Life 17 Nov. 142/2 The rest of the day is spent in the composition of..a speech to stir up interest in the preservation of the California redwoods. 1968 R. Kroetsch Alberta iii. 85 The higher lands were lush with palms, sycamores, redwoods, fig trees, and magnolias. 2006 New Yorker 9 Oct. 32/1 The coast redwood, or Sequoia sempervirens, which is most often simply called the redwood, is a massive conifer. †3. Scottish. = heartwood n. 2. Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΘΚΠ society > occupation and work > materials > raw material > wood > [noun] > wood from specific part of tree heartwood?1575 wood1600 alburnum1664 whitewood1668 sap-wood1791 redwood1825 1825 J. Jamieson Etymol. Dict. Sc. Lang. Suppl. Red-Wood, the name given to the reddish, or dark-coloured, and more incorruptible, wood found in the heart of trees. 4. Reaction or compression wood, esp. in gymnospermous trees. ΘΚΠ the world > plants > part of plant > part of tree or woody plant > wood > [noun] > juvenile or reaction wood redwood1916 tension wood1924 compression wood1925 reaction wood1948 juvenile wood1956 1916 Forest Q. 14 500 Hence one may speak of ‘tension wood’ and ‘compression wood’, or according to the color (when fresh) of ‘white wood’ and ‘red wood’. 1925 Spiral Tracheids & Fiber-Tracheids: Trop. Woods (Yale Univ. Sch. of Forestry) 12 In so-called compression wood or ‘red’ wood (rotholz), found in both the Angiospermae and Gymnospermae, the cells have a thick laminated secondary wall, slit into a large number of closely compressed spiral lamellae. 2000 W. C. Dickison Integrative Plant Anat. xii. 407 The reaction wood of gymnosperms forms on the lower or compression side of the woody cylinder and is commonly known as compression wood, otherwise called redwood. Compounds General attributive, as redwood bark, redwood lumber, redwood tree, etc. ΚΠ 1744 W. Smith's New Voy. Guinea 160 The Redwood Tree, so call'd by the Europeans, is also very large. 1745 P. Thomas True Jrnl. Voy. South-Seas 168 There are several others [trees] among which is one we call'd the Red-Wood-Tree, or Iron-Wood, from its great solidity. 1825 ‘J. Nicholson’ Operative Mechanic 84 The arms are of redwood fir, 6 inches square. 1883 Harper's Mag. July 815/2 Extensive yards of the attractive redwood lumber. 1885 B. Harte Maruja ii. 21 A quaint stockade..thatched with red-wood bark. 1913 Times 31 Dec. 4/5 In its best stands the redwood tree will average anywhere from 225ft. to 350ft. in height. 1938 Amer. Home June 28/2 White siding walls ship-lapped in cedar on the first story and contrastingly laid with flush redwood sheathing on the upper story. 1961 W. P. Keller Canada's Wild Glory iii. 107 Driving up from California to the north-west, I had revelled in the splendour of the mighty redwood groves along the highway. 2006 Gold Coast Sun (Austral.) (Nexis) 6 Dec. 42 The villas also use corrugated iron, eco-ply plywood and polished redwood floors. This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022). Redwoodn.²adj.² Brit. /ˈrɛdwʊd/, U.S. /ˈrɛdˌwʊd/ Origin: From a proper name. Etymon: proper name Redwood. Etymology: < the name of Sir Thomas Boverton Redwood (1846–1919), English chemist, who designed this type of viscometer.The first of these viscometers was described in 1886 (see quot. 1886 for Redwood viscometer n. at sense A. 1a), the second in 1913 or earlier ( B. Redwood Petroleum (ed. 3, 1913) II. ix. 277). A. n.² 1. a. Redwood viscometer n. (also Redwood's viscometer) either of two types of viscometer (differing in the ranges of viscosity for which they are suitable), used chiefly to measure the viscosity of petroleum and its products. ΘΚΠ the world > matter > constitution of matter > density or solidity > viscosity > [noun] > specifically in scientific use > measurement of > instrument viscosimeter1868 viscometer1883 Saybolt viscometer1886 Redwood viscometer1896 Saybolt1904 1886 Jrnl. Soc. Chem. Industry 29 Mar. 131/1 He had been in the habit of using one of Mr. Redwood's instruments for determining viscosities.] 1896 B. Redwood Treat. Petroleum II. ix. 605 The Redwood viscometer..is a modification, designed by the author in 1885, of the instrument formerly used at the Battersea Works of Price's Patent Candle Company. 1912 Proc. Royal Soc. A. 87 157 The viscosity of the oil was measured with a Redwood's viscometer at intervals of 5° F. 1931 G. Barr Monogr. Viscometry iv. 96 Liquids for which the Redwood No. II viscometer is specified..are difficult to free from suspended impurities. 1972 Harker & Allen Fuel Sci. vii. 98 The two standard instruments are the No. 1 and the No. 2 Redwood viscometers. The former is used for thin oils having viscosities of less than 2,000 Redwood seconds, and the latter for more viscous oils. 1985 Jrnl. Agric. & Food Chem. 33 1228/1 Viscosity of the starch and starch-surfactant complex solutions..was determined by the ISI procedure using Redwood viscometer No. 1. b. Redwood second n. a measure of viscosity used in conjunction with a Redwood viscometer and equal to one second of the time required for a given quantity of fluid to pass through a capillary in the instrument; cf. sense B. ΘΚΠ the world > matter > constitution of matter > density or solidity > viscosity > [noun] > specifically in scientific use > measurement of > unit Saybolt viscometer1886 Redwood unit1912 Saybolt viscosity1912 Redwood second1922 1922 A. R. Leask Marine Engines xi. 263 Redwood second readings, divided by 500, give Michell absolute readings. 1949 A. C. Merrington Viscometry v. 57 The results are normally expressed as ‘Redwood seconds’ at the temperature of the test. 1990 W. A. Livesey GCSE Motor Vehicle Stud. vii. 63/1 Viscosity..is calculated by timing how long it takes a set quantity of oil to flow through a tube of fixed diameter. The time is given in Redwood seconds. 2003 A. Hebra Measure for Measure xii. 164 Saybolt seconds, Redwood seconds, and the like are not true units of viscosity, but a measure of viscosity. 2. Used chiefly attributively with reference to measurements made according to a scale of Redwood seconds; esp. in Redwood time, Redwood unit, Redwood viscosity, etc. ΘΚΠ the world > matter > constitution of matter > density or solidity > viscosity > [noun] > specifically in scientific use > measurement of > unit Saybolt viscometer1886 Redwood unit1912 Saybolt viscosity1912 Redwood second1922 1912 Proc. Royal Soc. A. 87 158 If we wish to obtain a criterion as to whether the first or second law should..be applicable to a fluid for which Redwood's viscosity is known, we have the equations (1). 1913 Petroleum World June 272/1 The remaining three columns respectively give their colour, density at 20° C. and viscosity at 20° in Redwood units. 1919 Jrnl. Industr. & Engin. Chem. 11 155/1 Mineral oils..of pale color and low viscosity ranging from 100 to 200 sec., Redwood Standard, at a temperature of 200° F. 1949 A. C. Merrington Viscometry v. 57 A Redwood time of T_R seconds. 1967 A. S. Brunjes in Bland & Davidson Petroleum Processing Handbk. xii. 32 The Kinematic, Saybolt, Universal, redwood [sic] No. 1, and Engler scales. 1983 Buck & Hickman Catal. 1983–5 724/2 The BQ10 is..capable of dealing with heavy viscosity oils up to 600 Redwoods No 1. B. adj.² As postmodifier. Designating the time in seconds for a liquid to pass through a capillary in a Redwood viscometer; cf. sense A. 1b. ΘΚΠ the world > matter > constitution of matter > density or solidity > viscosity > [adjective] > relating to measurement of viscosity viscosimetric1895 Redwood1930 viscometric1938 1930 Engineering 5 Sept. 308/1 The fuel used throughout this test was Mexican boiler oil with..a viscosity of 200 secs. Redwood. 1973 J. G. C. Pope in Hobson & Pohl Mod. Petroleum Technol. (ed. 4) xviii. 654 The viscosity of relatively mobile oils is recorded as so many seconds Redwood I @ 100° F. 2003 A. R. Day et al. Heating Syst. iii. 101 Grade ‘D’ fuel oil is sometimes referred to as ‘35 sec oil’, which relates to a former specification of its viscosity as 35 seconds Redwood. This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022). > see also also refers to : red-woodadj.¹ < n.¹a1533n.²adj.²1896 see also
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redwoodn.1

Compounds

Redwoodn.2adj.2

> see also

redwoodn.¹

Redwoodn.²adj.²