noun, plural tomenta [tuh-men-tuh] . Botany, Entomology.
pubescence consisting of longish, soft, entangled hairs pressed close to the surface.

1690–1700; < Neo-Latin tōmentum, Latin: stuffing (of wool, hair, etc.) for cushions Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tomentum (təˈmɛntəm)
n , pl -ta
1.  a feltlike covering of downy hairs on leaves and other plant parts
2.  a network of minute blood vessels occurring in the human brain between the pia mater and cerebral cortex
[C17: New Latin, from Latin: stuffing for cushions; related to Latin tumēre to swell]

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American Heritage
Medical Dictionary

tomentum to·men·tum (tō-měn'təm)
n. pl. to·men·ta (-tə)
A network of extremely small blood vessels passing between the pia mater and the cerebral cortex.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The leaves and stems are covered with a white wooly tomentum, or pubescence, early in the season.
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