1 A type of valve in brass instr., bored with passages which, when it is depressed within its casing, deflect the air‐stream passing through it into the valve tubing. First valve lowers pitch a tone, 2nd a semitone, 3rd 3 semitones. If a 4th valve is added, it is adjusted to lower pitch 2 tones and a semitone, or a perfect 4th. New harmonic series can be prod. from these valves singly or in combination.
2 (Fr.). Abbreviation for cornet‐à‐pistons, the cornet.
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