Pronunciation: (dī"u-pā'zun, -sun), [key]
n. Music.
1. a full, rich outpouring of melodious sound.
2. the compass of a voice or instrument.
3. a fixed standard of pitch.
4. either of two principal timbres or stops of a pipe organ, one of full, majestic tone (open diapason) and the other of strong, flutelike tone (stopped diapason).
5. any of several other organ stops.
6. a tuning fork.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

dianthusdiapason normal pitch
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