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hair
(hār)
any thin, threadlike structure.
especially, the specialized epidermal structure produced only by mammals, developing from a papilla sunk in the dermis. The life cycle of a hair (hair cycle) consists of three phases, called anagen, catagen, and telogen. Called also pilus.
Hair in longitudinal section (A), and in cross section (B), showing the surrounding root and dermal sheaths.
the aggregate of such structures.
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