hair (hār) pilus; a threadlike structure, especially the specialized epidermal structure composed of keratin and developing from a papilla sunk in the dermis, produced only by mammals and characteristic of that group of animals. Also, the aggregate of such hairs.hair´y 
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Hair in longitudinal section (A), and in cross section (B), showing the surrounding root and dermal sheaths.
bamboo hair trichorrhexis nodosa.
beaded hair hair marked with alternate swellings and constrictions, as in monilethrix.
burrowing hair one that grows horizontally beneath the surface of the skin.
club hair one whose root is surrounded by a bulbous enlargement composed of keratinized cells, preliminary to normal loss of the hair from the follicle.
ingrown hair one that emerges from the skin but curves and reenters it.
lanugo hair lanugo.
resting hair see telogen.
sensory hairs hairlike projections on the cells of sensory epithelium.
taste hairs clumps of microvilli that form short hairlike processes projecting into the lumen of a taste pore from the peripheral ends of the taste cells. 
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Taste hairs protruding from the pore of a taste bud.
terminal hair the coarse hair on various areas of the body during adult years.
twisted hair one which at spaced intervals is twisted through an axis of 180 degrees, being abnormally flattened at the site of twisting.
vellus hair vellus (1).
| beaded hair n. See monilethrix. |
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