from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A hairlike or bristlelike outgrowth, as from the epidermis of a plant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hair- or scale-like extension of the epidermis of a plant.
  • n. Hairlike structures found in some microscopic organisms and algae.
  • n. A row of cells formed by successive cell divisions.

from the GNU version of the Collaborative International Dictionary of English

  • n. A hair on the surface of leaf or stem, or any modification of a hair, as a minute scale, or star, or gland. The sporangia of ferns are believed to be of the nature of trichomes.

from The Century Dictionary and Cyclopedia

  • n. An outgrowth from the epidermis of plants, as a hair, scale, bristle, or prickle. These may be very various in form and function, but morphologically they have a common origin.


Greek trikhōma, growth of hair, from trikhoun, to cover with hair, from thrix, trikh-, hair.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • Some of the little parasitic queens, indeed, are actually provided with tufts of long hairs or "trichomes," which are apparently saturated with attractive ethereal materials highly prized by the host workers, which spend much of their time licking these trichomes and tending the bearers of them.

    - Caryl P. Haskins, Of Ants and Men, 1939, p. 113

    December 11, 2008