tomentumn.

Brit.

/tə(ʊ)ˈmɛntəm/, U.S.

/toʊˈmɛn(t)əm/

Inflections: Plural tomenta, (rare) tomentums.

Origin: A borrowing from Latin. Etymon: Latin tomentum.

Etymology: < classical Latin tomentum stuffing for cushions, in post-classical Latin also pubescence growing on the surface of various parts of plants and fungi (mid 17th cent. or earlier), flocculent inner surface of the pia mater (1705 or earlier), of uncertain origin; perhaps < an unattested verb in the sense ‘to swell, increase’ < the same base as classical Latin tōtus whole (see total adj.) + -mentum -ment suffix.

a. Botany. Soft down or pubescence growing on the surface of the leaves, stems, seeds, or other parts of various plants and fungi.

ΘΚΠ

the world > plants > part of plant > hair or bristle > [noun] > downy covering

downa1382

woolc1400

cotton1551

frieze1640

dowl1661

tomentum1693

pubescence1760

pubes1772

shag1774

indumentum1847

shaggy hairs1884

1693 Philos. Trans. (Royal Soc.) 17 667 Many Seeds..set about with..yellow fine silken Down..and yellowish Membranes enclosing the Stylus and Tomentum.

a1793 G. White Observ. Insects in Nat. Hist. Selborne (1802) II. 227 A sort of wild bee frequenting the garden-campion for the sake of its tomentum.

1866 J. Lindley & T. Moore Treasury Bot. I. at Centaurea Leaves clothed on both surfaces with a white silky tomentum.

1951 Auk 68 460 Some nests are rimmed with the down of thistles..and the bright red-brown tomenta of ferns.

1995 B. Bell in S. M. Glynn & R. Duit Learning Sci. in Schools xv. 352 The feel of the furry tomentum on a daisy leaf.

2010 M. Kuo & A. Methven 100 Cool Mushrooms 21 Cap 5–10 cm wide, convex to plane, sticky, covered with a white tomentum.

b. Entomology. A similar covering of down, pubescence, or short fine hairs on the cuticle of an insect.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > hair > down

pubescence1826

tomentum1853

pubes1909

1853 F. Walker Insecta Britannica: Diptera II. 5 Abdomen black at the base, covered with hoary tomentum towards the tip.

1939 Trans. Kansas Acad. Sci. 42 270 The female..is much different with its contrasting spots and tufts of white, black, and yellow pile and tomentum.

2000 C. D. Michener Bees of World lxiv. 357/1 They..differ from most Ctenonomia in lacking basal bands of tomentum on the metasomal terga.

2010 J. A. Rafael & J. H. Skevington in B. V. Brown et al. Man. Central Amer. Diptera II. 795/2 In order to secure the ground color and tomentum of pipunculids, specimens should ultimately be dried and pinned.

†2. Chiefly Anatomy. A covering, lining, or surface resembling down or felt; spec. (in full tomentum cerebri) the flocculent inner surface of the pia mater, consisting of numerous minute vessels entering the brain and spinal cord. Obsolete. [In tomentum cerebri after scientific Latin tomentum cerebri downy lining of the brain (1778 or earlier).]

ΘΚΠ

the world > life > the body > nervous system > cerebrospinal axis > [noun] > membranes > pia mater > part of

tomentum1723

velum1839

1723 tr. R. J. C. de Garengeot Treat. Chirurg. Operations xxxv. 326 The pituitous Membrane of the Nose is provided with a vast Number of small Glands, the Tomentum [Fr. le Tomentum ou le duvet] whereof, or the Vesicle, as some will have it, is imbibed from the very first Conformation, with a Humor perfectly like the thick Lympha, which moistens that whole Membrane.

1742 G. Cheyne Nat. Method cureing Dis. i. 24 A Down, Velvet, or Tomentum, being discover'd in all the secretory Ducts of the Glands.

1800 A. Fyfe Compend. Anat. Human Body for Use Students II. iv. 16 The Circumvolutions are every where connected to the Pia Mater by an infinite number of small Vessels,—called by Ruysch, Tomentum Cerebri,—which run into the Substance of the Brain.

1836 Edinb. Med. & Surg. Jrnl. 45 42 Its exterior surface [sc. that of the human ovum], which is formed by the chorion, is found to be invested with a thick tomentum, to which is commonly applied such an epithet as lanuginous or villous.

1855 W. T. Helmuth Surg. & its Adaptation to Homœopathic Pract. xiv. 282 The transverse threads of soft old linen are drawn out by a machine, leaving the longitudinal ones covered by a sort of tomentum or cotton-like mass.

1873 Brit. Med. Jrnl. 11 Oct. 433/2 The general tenor of the paper was to indicate the existence of an anatomical sheath of the cerebral arteries, formed by an extension inwards of the tomentum cerebri.

1893 B. G. Wilder Physiol. Practicums viii. 51 All surfaces denuded of the pia may be seen to be finely punctate, as if by pin pricks, and the ental surface of the pia to present a woolly aspect called tomentum, from the large number of broken vessels.

Derivatives

† tomentigerous adj. [ < tomentum n. + -igerous comb. form, after scientific Latin tomentiger (1795 or earlier as a specific name); compare French tomentigère (1834 or earlier)] Entomology Obsolete rare having a tomentose or downy body.

ΚΠ

1860 R. G. Mayne Expos. Lexicon Med. Sci. 1281/1 Tomentiger.., Entomol., having the body hairy or downy: tomentigerous.

toˈmentulose adj. [ < tomentum n. + -ulose suffix¹, after scientific Latin tomentulosus (1803 or earlier)] chiefly Botany finely or slightly tomentose or downy.

ΚΠ

1837 J. Macfadyen Flora Jamaica I. 308 Coralla less than twice the length of the calyx, 5-fid, tubulose, slit on one side, externally yellowish, tomentulose.

1900 B. D. Jackson Gloss. Bot. Terms 272 Tomentulose, slightly tomentose.

2008 Molecular Phylogenetics & Evol. 49 926/1 Relatively long arms versus a short stalk form a tomentuloseindument.

This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).

单词	tomentum
释义	tomentumn. Brit. /tə(ʊ)ˈmɛntəm/, U.S. /toʊˈmɛn(t)əm/ Inflections: Plural tomenta, (rare) tomentums. Origin: A borrowing from Latin. Etymon: Latin tomentum. Etymology: < classical Latin tomentum stuffing for cushions, in post-classical Latin also pubescence growing on the surface of various parts of plants and fungi (mid 17th cent. or earlier), flocculent inner surface of the pia mater (1705 or earlier), of uncertain origin; perhaps < an unattested verb in the sense ‘to swell, increase’ < the same base as classical Latin tōtus whole (see total adj.) + -mentum -ment suffix. 1. a. Botany. Soft down or pubescence growing on the surface of the leaves, stems, seeds, or other parts of various plants and fungi. ΘΚΠ the world > plants > part of plant > hair or bristle > [noun] > downy covering downa1382 woolc1400 cotton1551 frieze1640 dowl1661 tomentum1693 pubescence1760 pubes1772 shag1774 indumentum1847 shaggy hairs1884 1693 Philos. Trans. (Royal Soc.) 17 667 Many Seeds..set about with..yellow fine silken Down..and yellowish Membranes enclosing the Stylus and Tomentum. a1793 G. White Observ. Insects in Nat. Hist. Selborne (1802) II. 227 A sort of wild bee frequenting the garden-campion for the sake of its tomentum. 1866 J. Lindley & T. Moore Treasury Bot. I. at Centaurea Leaves clothed on both surfaces with a white silky tomentum. 1951 Auk 68 460 Some nests are rimmed with the down of thistles..and the bright red-brown tomenta of ferns. 1995 B. Bell in S. M. Glynn & R. Duit Learning Sci. in Schools xv. 352 The feel of the furry tomentum on a daisy leaf. 2010 M. Kuo & A. Methven 100 Cool Mushrooms 21 Cap 5–10 cm wide, convex to plane, sticky, covered with a white tomentum. b. Entomology. A similar covering of down, pubescence, or short fine hairs on the cuticle of an insect. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > hair > down pubescence1826 tomentum1853 pubes1909 1853 F. Walker Insecta Britannica: Diptera II. 5 Abdomen black at the base, covered with hoary tomentum towards the tip. 1939 Trans. Kansas Acad. Sci. 42 270 The female..is much different with its contrasting spots and tufts of white, black, and yellow pile and tomentum. 2000 C. D. Michener Bees of World lxiv. 357/1 They..differ from most Ctenonomia in lacking basal bands of tomentum on the metasomal terga. 2010 J. A. Rafael & J. H. Skevington in B. V. Brown et al. Man. Central Amer. Diptera II. 795/2 In order to secure the ground color and tomentum of pipunculids, specimens should ultimately be dried and pinned. †2. Chiefly Anatomy. A covering, lining, or surface resembling down or felt; spec. (in full tomentum cerebri) the flocculent inner surface of the pia mater, consisting of numerous minute vessels entering the brain and spinal cord. Obsolete. [In tomentum cerebri after scientific Latin tomentum cerebri downy lining of the brain (1778 or earlier).] ΘΚΠ the world > life > the body > nervous system > cerebrospinal axis > [noun] > membranes > pia mater > part of tomentum1723 velum1839 1723 tr. R. J. C. de Garengeot Treat. Chirurg. Operations xxxv. 326 The pituitous Membrane of the Nose is provided with a vast Number of small Glands, the Tomentum [Fr. le Tomentum ou le duvet] whereof, or the Vesicle, as some will have it, is imbibed from the very first Conformation, with a Humor perfectly like the thick Lympha, which moistens that whole Membrane. 1742 G. Cheyne Nat. Method cureing Dis. i. 24 A Down, Velvet, or Tomentum, being discover'd in all the secretory Ducts of the Glands. 1800 A. Fyfe Compend. Anat. Human Body for Use Students II. iv. 16 The Circumvolutions are every where connected to the Pia Mater by an infinite number of small Vessels,—called by Ruysch, Tomentum Cerebri,—which run into the Substance of the Brain. 1836 Edinb. Med. & Surg. Jrnl. 45 42 Its exterior surface [sc. that of the human ovum], which is formed by the chorion, is found to be invested with a thick tomentum, to which is commonly applied such an epithet as lanuginous or villous. 1855 W. T. Helmuth Surg. & its Adaptation to Homœopathic Pract. xiv. 282 The transverse threads of soft old linen are drawn out by a machine, leaving the longitudinal ones covered by a sort of tomentum or cotton-like mass. 1873 Brit. Med. Jrnl. 11 Oct. 433/2 The general tenor of the paper was to indicate the existence of an anatomical sheath of the cerebral arteries, formed by an extension inwards of the tomentum cerebri. 1893 B. G. Wilder Physiol. Practicums viii. 51 All surfaces denuded of the pia may be seen to be finely punctate, as if by pin pricks, and the ental surface of the pia to present a woolly aspect called tomentum, from the large number of broken vessels. Derivatives † tomentigerous adj. [ < tomentum n. + -igerous comb. form, after scientific Latin tomentiger (1795 or earlier as a specific name); compare French tomentigère (1834 or earlier)] Entomology Obsolete rare having a tomentose or downy body. ΚΠ 1860 R. G. Mayne Expos. Lexicon Med. Sci. 1281/1 Tomentiger.., Entomol., having the body hairy or downy: tomentigerous. toˈmentulose adj. [ < tomentum n. + -ulose suffix¹, after scientific Latin tomentulosus (1803 or earlier)] chiefly Botany finely or slightly tomentose or downy. ΚΠ 1837 J. Macfadyen Flora Jamaica I. 308 Coralla less than twice the length of the calyx, 5-fid, tubulose, slit on one side, externally yellowish, tomentulose. 1900 B. D. Jackson Gloss. Bot. Terms 272 Tomentulose, slightly tomentose. 2008 Molecular Phylogenetics & Evol. 49 926/1 Relatively long arms versus a short stalk form a tomentuloseindument. This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022). < n.1693
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