porousadj.

Brit.

/ˈpɔːrəs/, U.S.

/ˈpɔrəs/

Forms: Middle English porus, Middle English–1500s porouse, Middle English– porous, 1500s porrus.

Origin: Of multiple origins. Partly a borrowing from French. Partly a borrowing from Latin. Etymons: French poreux; Latin porosus.

Etymology: < (i) Middle French poreux (c1280 in Old French; French poreux ) and its etymon (ii) post-classical Latin porosus (from c1120 in British sources) < porus pore n.¹ + classical Latin -ōsus -ous suffix. Compare Catalan porós (c1300), Spanish poroso (c1250), Italian poroso (1298).

a. Full of pores; containing minute interstices through which water, air, etc., may pass.

ΘΚΠ

the world > space > relative position > condition of being open or not closed > an opening or aperture > [adjective] > having (a) hole(s) > full of holes > porous

plummya1398

porousa1398

hollow1398

sponged1398

spongeous1398

porosea1400

spongiousc1400

pory1535

spongy1578

sponge-like1594

lax1615

porish1652

laxy1716

spongiose1755

spongiform1805

spongeoid1822

spongoid1843

polyporous1858

a1398 J. Trevisa tr. Bartholomaeus Anglicus De Proprietatibus Rerum (BL Add.) f. 47 Þe tonge..is..porouse [L. porosa] & holly, þat þe sauour persche & come þe esiloker to þe synewe þat makeþ þe taast.

c1484 (a1475) J. de Caritate tr. Secreta Secret. (Takamiya) (1977) 174 (MED) Þat rar, porous, or lyght is mor bettyr þan qwyche is thyk of substauns.

1567 J. Maplet Greene Forest f. 33 It is nothing solide or massie, but much porouse.

1625 N. Carpenter Geogr. Delineated ii. ix. 153 The Porous and spongy nature of the Earth, which is apt to drinke in the water of the sea.

1764 Philos. Trans. 1763 (Royal Soc.) 53 232 On dissection, the liver was found considerably enlarged..; internally, more porous and spungy.

1853 ‘R. Haywarde’ Prismatics 168 In the Tropics there are certain porous vessels, through which fluids, no matter how impure, distil in bright drops.

1913 W. Cather O Pioneers! ii. vi. 137 Carl fingered the blue-green leaves, porous like blotting-paper.

1979 D. Attenborough Life on Earth vii. 153 The embryo must breathe, so the shell has to be slightly porous to enable oxygen to pass in and carbon dioxide to pass out.

2001 Art Room Catal. Autumn 25/1 Unglazed YiXing teapots are highly prized for their porous quality and absorb the flavour, aroma and colour of tea brewed in them.

b. figurative. Not retentive or secure, esp. admitting the passage of people, information, etc.

ΚΠ

1642 H. More Ψυχωδια Platonica sig. M6 Many [arguments]..go through their more porous and spongie minds without any sensible impression.

1795 S. T. Coleridge Plot Discovered 19 But our minister's..style is infinitely porous.

1864 T. Carlyle Hist. Friedrich II of Prussia IV. xvi. vii. 344 Men are very porous; weighty secrets oozing out of them, like quicksilver through clay jars.

1993 N.Y. Times 2 Sept. a13/2 There are porous borders from the Caucasus to the Urals, convenient for drug smuggling.

2000 Classical Rev. 50 273 The boundary between ‘colloquial’ and ‘formal’ is a very porous one.

2. Taking place through or by means of pores; (Botany) designating dehiscence in which the seeds are discharged through holes in the fruit.

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > seed > seed-vessel or pericarp > [adjective] > dehiscent

ruptile1721

septicidal1812

septifragal1819

sutural1819

circumscissile1835

dehiscing1839

dehiscent1845

porous1861

circumsciss1870

1861 R. Bentley Man. Bot. i. iv. 311 Porous Dehiscence..is an irregular kind of dehiscence.

1914 F. E. Fritsch & E. J. Salisbury Introd. Study Plants xxii. 281 The ripe fruit of the Poppy..exhibits a series of pores beneath the flat top (porous dehiscence), due to the wall between each pair of placentas curling slightly outwards at these points.

1971 R. Brewer Approach to Print v. 63 Screen process is..printing by squeezing colour through a stencil which is held in place by a fine-mesh screen tightly stretched over a frame, and has been called ‘porous printing’.

2003 Earth & Planetary Sci. Lett. 213 417 We also examine melt transport via porous flow in a melt-rich layer at the base of the lithosphere.

Compounds

porous plaster n. Medicine a plaster having numerous small holes pierced through it so as to enable it to lie smoothly.

ΚΠ

1848 Zanesville (Ohio) Courier 4 Oct. 4/3 (advt.) The genuine India Rubber Porous Strengthening Plaster—a certain remedy for Rheumatism.]

1861 N.Y. Times 12 Nov. 8/6 (advt.) Allcock's porous strengthening plasters... There is nothing equal, in the way of a plaster, to the Porous Plaster of Mr. Allcock.

1900 Cent. Mag. Feb. 644/2 We received several quite unsolicited testimonials to the merits of Perkins' Patent Porous Plaster.

1955 Lancet 8 Jan. 68/1 The plasters used were: (1) a porous plaster of standard spread, and (2) a porous plaster said to contain neither rubber nor resin.

1985 Business Week (Nexis) 11 Feb. 128 Some products.., such as an ‘Allcock's Porous Plaster’ to reduce the pain of lumbago and sciatica,..are made today by the same companies that put them on the market more than 100 years ago.

This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022).

单词	porous
释义	porousadj. Brit. /ˈpɔːrəs/, U.S. /ˈpɔrəs/ Forms: Middle English porus, Middle English–1500s porouse, Middle English– porous, 1500s porrus. Origin: Of multiple origins. Partly a borrowing from French. Partly a borrowing from Latin. Etymons: French poreux; Latin porosus. Etymology: < (i) Middle French poreux (c1280 in Old French; French poreux ) and its etymon (ii) post-classical Latin porosus (from c1120 in British sources) < porus pore n.¹ + classical Latin -ōsus -ous suffix. Compare Catalan porós (c1300), Spanish poroso (c1250), Italian poroso (1298). 1. a. Full of pores; containing minute interstices through which water, air, etc., may pass. ΘΚΠ the world > space > relative position > condition of being open or not closed > an opening or aperture > [adjective] > having (a) hole(s) > full of holes > porous plummya1398 porousa1398 hollow1398 sponged1398 spongeous1398 porosea1400 spongiousc1400 pory1535 spongy1578 sponge-like1594 lax1615 porish1652 laxy1716 spongiose1755 spongiform1805 spongeoid1822 spongoid1843 polyporous1858 a1398 J. Trevisa tr. Bartholomaeus Anglicus De Proprietatibus Rerum (BL Add.) f. 47 Þe tonge..is..porouse [L. porosa] & holly, þat þe sauour persche & come þe esiloker to þe synewe þat makeþ þe taast. c1484 (a1475) J. de Caritate tr. Secreta Secret. (Takamiya) (1977) 174 (MED) Þat rar, porous, or lyght is mor bettyr þan qwyche is thyk of substauns. 1567 J. Maplet Greene Forest f. 33 It is nothing solide or massie, but much porouse. 1625 N. Carpenter Geogr. Delineated ii. ix. 153 The Porous and spongy nature of the Earth, which is apt to drinke in the water of the sea. 1764 Philos. Trans. 1763 (Royal Soc.) 53 232 On dissection, the liver was found considerably enlarged..; internally, more porous and spungy. 1853 ‘R. Haywarde’ Prismatics 168 In the Tropics there are certain porous vessels, through which fluids, no matter how impure, distil in bright drops. 1913 W. Cather O Pioneers! ii. vi. 137 Carl fingered the blue-green leaves, porous like blotting-paper. 1979 D. Attenborough Life on Earth vii. 153 The embryo must breathe, so the shell has to be slightly porous to enable oxygen to pass in and carbon dioxide to pass out. 2001 Art Room Catal. Autumn 25/1 Unglazed YiXing teapots are highly prized for their porous quality and absorb the flavour, aroma and colour of tea brewed in them. b. figurative. Not retentive or secure, esp. admitting the passage of people, information, etc. ΚΠ 1642 H. More Ψυχωδια Platonica sig. M6 Many [arguments]..go through their more porous and spongie minds without any sensible impression. 1795 S. T. Coleridge Plot Discovered 19 But our minister's..style is infinitely porous. 1864 T. Carlyle Hist. Friedrich II of Prussia IV. xvi. vii. 344 Men are very porous; weighty secrets oozing out of them, like quicksilver through clay jars. 1993 N.Y. Times 2 Sept. a13/2 There are porous borders from the Caucasus to the Urals, convenient for drug smuggling. 2000 Classical Rev. 50 273 The boundary between ‘colloquial’ and ‘formal’ is a very porous one. 2. Taking place through or by means of pores; (Botany) designating dehiscence in which the seeds are discharged through holes in the fruit. ΘΚΠ the world > plants > part of plant > reproductive part(s) > seed > seed-vessel or pericarp > [adjective] > dehiscent ruptile1721 septicidal1812 septifragal1819 sutural1819 circumscissile1835 dehiscing1839 dehiscent1845 porous1861 circumsciss1870 1861 R. Bentley Man. Bot. i. iv. 311 Porous Dehiscence..is an irregular kind of dehiscence. 1914 F. E. Fritsch & E. J. Salisbury Introd. Study Plants xxii. 281 The ripe fruit of the Poppy..exhibits a series of pores beneath the flat top (porous dehiscence), due to the wall between each pair of placentas curling slightly outwards at these points. 1971 R. Brewer Approach to Print v. 63 Screen process is..printing by squeezing colour through a stencil which is held in place by a fine-mesh screen tightly stretched over a frame, and has been called ‘porous printing’. 2003 Earth & Planetary Sci. Lett. 213 417 We also examine melt transport via porous flow in a melt-rich layer at the base of the lithosphere. Compounds porous plaster n. Medicine a plaster having numerous small holes pierced through it so as to enable it to lie smoothly. ΚΠ 1848 Zanesville (Ohio) Courier 4 Oct. 4/3 (advt.) The genuine India Rubber Porous Strengthening Plaster—a certain remedy for Rheumatism.] 1861 N.Y. Times 12 Nov. 8/6 (advt.) Allcock's porous strengthening plasters... There is nothing equal, in the way of a plaster, to the Porous Plaster of Mr. Allcock. 1900 Cent. Mag. Feb. 644/2 We received several quite unsolicited testimonials to the merits of Perkins' Patent Porous Plaster. 1955 Lancet 8 Jan. 68/1 The plasters used were: (1) a porous plaster of standard spread, and (2) a porous plaster said to contain neither rubber nor resin. 1985 Business Week (Nexis) 11 Feb. 128 Some products.., such as an ‘Allcock's Porous Plaster’ to reduce the pain of lumbago and sciatica,..are made today by the same companies that put them on the market more than 100 years ago. This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022). < adj.a1398
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