a hair

Medical Dictionary

hair (hâr)
n.

  1. Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.

  2. A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human.

  3. One of the fine hairlike processes of a sensory cell.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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