- hair [her, har]n.[ME here < OE hær (akin to Ger haar, Frank * harja) & < ? OFr haire, hair shirt < Frank * harja < IE base * k̑er(s)-, to bristle]1. any of the fine, threadlike outgrowths from the skin of an animal or human being2. a growth of these; esp.,a) the growth covering the human headb) the growth covering all or part of the skin of most mammals3. material woven from hair4. an extremely small space, margin, degree, etc. [to miss by a hair]5. Bot. a threadlike growth on a plant; trichomeadj.1. made of or with hair2. for the care of the hair [hair tonic]——————☆ get in one's hairSlang to annoy one——————hair of the dog that bit one or hair of the dogInformal a drink of alcoholic liquor taken as a supposed cure for a hangover——————have by the short hairs or get by the short hairsSlang to have (or get) completely at one's mercy——————let one's hair downSlang to be very informal, relaxed, and free in behavior——————make one's hair stand on endto terrify or horrify one——————not turn a hairto show no fear, surprise, embarrassment, etc.; stay calm and unruffled——————split hairsto make petty distinctions; quibble——————to a hairexactly; right in every detailhairlikeadj.
English World dictionary. V. Neufeldt. 2014.