a wind instrument consisting of a conical or cylindrical usually metal tube, a cup-shaped mouthpiece, and a flared bell. a musical instrument (such as a cornet) resembling a trumpet. a trumpet player. something that resembles a trumpet or its tonal quality: such as a funnel-shaped instrument (such as a megaphone) for collecting, directing, or intensifying sound - a stentorian voice - a penetrating cry (as of an elephant). to blow a trumpet. to make a sound suggestive of that of a trumpet. to sound or proclaim on or as if on a trumpet.