In music, a diapason is the concord of the first and last notes of an octave. The word is also used for the most important foundation-stops of an organ. They are of several kinds, as open diapason, stopped diapason, double diapason. The French use the term as equivalent to pitch in music. Research Diapason
An open diapason is 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. Research Open Diapason
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Abbreviations
Research Diapason
