Open diapason

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(Mus.) a certain stop in an organ, in which the pipes or tubes are formed like the mouthpiece of a flageolet at the end where the wind enters, and are open at the other end.

See also: Open

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in classic literature ?
Initiated in low and subdued tones, the sound soon rose in volume to the open diapason of barbaric blood lust.
I then gave Lys a piece of dried meat, and sitting inside the entrance, we dined as must have some of our ancient forbears at the dawning of the age of man, while far below the open diapason of the savage night rose weird and horrifying to our ears.
The English early 17th-century organ was characterized by wooden pipes with a narrow mouth and small toe-hole, which produced a gentle, blending sound; indeed, taste before the Civil War was for an open diapason which has a similar harmonic mix to the viol.