Anatomy
hair Audio
hair [ hair ]
Subclass of:
Integumentary system
Definitions related to hair:
  • A filament-like structure consisting of a shaft which projects to the surface of the SKIN from a root which is softer than the shaft and lodges in the cavity of a HAIR FOLLICLE. It is found on most surfaces of the body.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Filament-like structure composed of keratin, consisting of a shaft which projects to the surface of the skin from a root which is softer than the shaft and lodges in the cavity of a hair follicle.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The filamentous outgrowth of the epidermis.
    NCI
    U.S. National Cancer Institute, 2021
  • The human hair follicle is an intriguing structure, and much remains to be learned about hair anatomy and its growth. The hair follicle can be divided into 3 regions: the lower segment (bulb and suprabulb), the middle segment (isthmus), and the upper segment (infundibulum).
    Medscape
    WebMD, 2025
  • Hair, in mammals, the characteristic threadlike outgrowths of the outer layer of the skin (epidermis) that form an animal's coat, or pelage. Hair is present in differing degrees on all mammals. On adult whales, elephants, sirenians, and rhinoceroses body hair is limited to scattered bristles. In...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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