a valved brass instrument used chiefly in brass and military bands, having a tube of conical bore and a brilliant tone colour. It resembles the tuba and constitutes a family of instruments related to the flugelhorn and cornet
Word origin
C19: named after Adolphe Sax (see saxophone), who invented it (1845)
saxhorn in American English
(ˈsæksˌhɔrn)
noun
any of a group of valved brass band instruments, with a full, even tone and a wide range