Definitions for hair follicle
Random House Webster's College Dictionary
a small cavity in the epidermis and corium of the skin, from which a hair develops.
Origin of hair follicle:
a small tubular cavity containing the root of a hair; small muscles and sebaceous glands are associated with them
U.S. National Library of Medicine
A tube-like invagination of the EPIDERMIS from which the hair shaft develops and into which SEBACEOUS GLANDS open. The hair follicle is lined by a cellular inner and outer root sheath of epidermal origin and is invested with a fibrous sheath derived from the dermis. (Stedman, 26th ed) Follicles of very long hairs extend into the subcutaneous layer of tissue under the SKIN.
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