D defs.my
Entry 1 sense Webster, 1913

Basset horn

/(băs"sĕt hôrn`)/ · Bas·set horn · IPA
01 a. An instrument blown with a reed, and resembling a clarinet, but of much greater compass, embracing nearly four octaves; The corno di bassetto.
  1. 1.
    An instrument blown with a reed, and resembling a clarinet, but of much greater compass, embracing nearly four octaves; The corno di bassetto.(Mus.)