HORSEHAIR Meaning of HORSEHAIR in English horse ‧ hair /ˈhɔːsheə $ ˈhɔːrsher/ BrE AmE noun [uncountable] the hair from a horse’s ↑ mane and tail, sometimes used to fill the inside of furniture Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012