1a : a wind instrument consisting of a conical or cylindrical usually metal tube, a cup-shaped mouthpiece, and a flared bell; specifically : a valved brass instrument having a cylindrical tube with two turns and a usual range from F sharp below middle C upward for 21⁄2octavesb : a musical instrument (as a cornet) resembling a trumpet
2: a trumpet player
3: something that resembles a trumpet or its tonal quality: asa : a funnel-shaped instrument (as a megaphone) for collecting, directing, or intensifying soundb (1) : a stentorian voice (2) : a penetrating cry (as of an elephant)