- Botany. an outgrowth from the epidermis of plants, as a hair.
- a microorganism composed of many filamentous cells arranged in strands or chains.
Origin of trichome
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- any hairlike outgrowth from the surface of a plant
- any of the threadlike structures that make up the filaments of blue-green algae
C19: from Greek trikhōma, from trikhoun to cover with hair, from thrix a hair
- One of the hairlike or bristlelike outgrowths on the epidermis of a plant. Trichomes serve a variety of functions, depending on their location. As root hairs (and as leaf hairs in epiphytes), trichomes absorb water and minerals. As leaf hairs, they reflect radiation, lower plant temperature, and reduce water loss. They also provide defense against insects.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.