hair

(noun) a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss. Examples: "He combed his hair." "Each hair consists of layers of dead keratinized cells."

(noun) a very small distance or space. Synonyms: hair's-breadth, hairsbreadth, whisker. Examples: "They escaped by a hair's-breadth." "They lost the election by a whisker."

(noun) filamentous hairlike growth on a plant. Synonyms: fuzz, tomentum. Examples: "Peach fuzz."

(noun) any of the cylindrical filaments characteristically growing from the epidermis of a mammal. Synonyms: pilus. Examples: "There is a hair in my soup."

(noun) cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments. Synonyms: haircloth.

(noun) a filamentous projection or process on an organism.