[tuh-men-tohs, toh-muhn-tohs]
adjective Botany, Entomology.
closely covered with down or matted hair.

1690–1700; < Neo-Latin tōmentōsus. See tomentum, -ose1 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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Leaves consist of three heart-shaped, serrated leaflets with purplish veins and are silvery white tomentose on the underside.
Some were found with tomentose leaves and one with white berries.
The abaxial surface of the thick leaves is tomentose and silvery-white.
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