Bas·set horn Mus. An instrument blown with a reed, and resembling a clarinet, but of much greater compass, embracing nearly four octaves; The corno di bassetto.
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Cor·no di bas·set·to pl. Corni di basseto. Mus. A tenor clarinet; -- called also basset horn, and sometimes confounded with the English horn, which is a tenor oboe.
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basset horn
n : a tenor clarinet; pitched in the key of F below the B-flat
clarinet