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open diapason

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noun
  1. See under diapason(def 4).
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Origin of open diapason

First recorded in 1870–75

diapason

[dahy-uh-pey-zuh n, -suh n]
noun 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.
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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
Related formsdi·a·pa·son·al, adjectivesub·di·a·pa·son, nounsub·di·a·pa·son·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for open diapason

diapason

noun music
  1. either of two stops (open and stopped diapason) usually found throughout the compass of a pipe organ that give it its characteristic tone colour
  2. the compass of an instrument or voice
  3. (chiefly in French usage)
    1. 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)
    2. a tuning fork or pitch pipe
  4. (in classical Greece) an octave
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Derived Formsdiapasonal or diapasonic (ˌdaɪəpeɪˈzɒnɪk, -ˈsɒn-), adjective

Word Origin

C14: from Latin: the whole octave, from Greek: () 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