Definition of brass instrument
: any of a group of wind instruments (such as a French horn, trombone, trumpet, or tuba) that is usually characterized by a long cylindrical or conical metal tube commonly curved two or more times and ending in a flared bell, that produces tones by the vibrations of the player's lips against a usually cup-shaped mouthpiece, and that usually has valves or a slide by which the player may produce all the tones within the instrument's range
First Known Use of brass instrument
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Britannica.com: Encyclopedia article about brass instrument
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