tear one hair out

Science Dictionary
hair   (hâr)  Pronunciation Key 


(click for larger image in new window)

  1. One of the fine strands that grow from the skin of mammals, usually providing insulation against the cold. Modified hairs sometimes serve as protective defenses, as in the quills of a porcupine or hedgehog, or as tactile organs, as in the whiskers (called vibrissae) of many nocturnal mammals. Hair filaments are a modification of the epidermis of the skin and are composed primarily of keratin. Hair also contains melanin, which determines hair color.

  2. A slender growth resembling a mammalian hair, found on insects and other animals.

  3. A fine, threadlike growth from the epidermis of plants. See more at trichome.


American Heritage
Science Dictionary
tear   (tîr)  Pronunciation Key 
A drop of the clear salty liquid secreted by glands (lacrimal glands) in the eyes. Tears wet the membrane covering the eye and help rid the eye of irritating substances.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature