brass instrument

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A wind instrument, such as the French horn or the trombone, made of brass or other metal. Sound is produced through vibration of the lips and adjustment of the length of the sound tube by means of valves or a slide.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun music A musical instrument whose tone is produced by vibration of the lips as the player blows into a mouth piece (or tubular resonator).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a wind instrument that consists of a brass tube (usually of variable length) that is blown by means of a cup-shaped or funnel-shaped mouthpiece