ˌɒm.bʊˈʃʊə ˈɑm.bə.ʃɚ maʊθ ˈmaʊθˌpiːs the aperture of a wind instrument into which the player blows directly the tube of a pipe or cigarette holder that a smoker holds in the mouth an acoustic device; the part of a telephone into which a person speaks (especially boxing) equipment that protects an athlete's mouth a part that goes over or into the mouth of a person the mouthpiece of a respirator a spokesperson (as a lawyer)