pipe organ

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

• noun The largest of all musical instruments, played from an organ console which produces its sound by sending air through whistles and/or reeds called organ pipes, by direct mechanical action, or modernly, electrically.

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

• noun wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard