Côr'net-a-pĭs'ton, n.

noun

Côr'net-a-pĭs'ton, n. [Fr.] (Mus.) A brass, wind, musical instrument, like the French horn or the trumpet, furnished with valves moved by small pistons or sliding rods.

An engraved illustration of a cornet-à-piston, a brass wind instrument with a flared bell and valves. — Cornet-à-piston.