See under diapason(def 4).
Origin of open diapason
First recorded in 1870–75
[dahy-uh-pey-zuh n, -suh n]
a full, rich outpouring of melodious sound.
the compass of a voice or instrument.
a fixed standard of pitch.
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).
any of several other organ stops.
a tuning fork.
Origin of diapason
1350–1400; Middle English diapasoun < Latin diapāsōn the whole octave < Greek dià pāsôn (chordôn) through all (the notes), short for hē dià pāsôn chordôn symphōnía the concord through all the notes of the scale
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
either of two stops (open and stopped diapason) usually found throughout the compass of a pipe organ that give it its characteristic tone colour
the compass of an instrument or voice
(chiefly in French usage)
- a standard pitch used for tuning, esp the now largely obsolete one of A above middle C = 435 hertz, known as diapason normal (French (djapazɔ̃ nɔrmal)
- a tuning fork or pitch pipe
(in classical Greece) an octave
Word Origin for diapason
C14: from Latin: the whole octave, from Greek: (hē) dia pasōn (khordōn sumphōnia) (concord) through all (the notes), from dia through + pas all
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012