DIAPASON

diapason, diapason stop

(noun) either of the two main stops on a pipe organ

Source: WordNet® 3.1

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Etymology

Noun

diapason (plural diapasons)

(music) The musical octave.

(by extension, literary) The range or scope of something, especially of notes in a scale, or of a particular musical instrument.

Synonyms: range, scope

(musical instrument) A tonal grouping of the flue pipes of a pipe organ.

Source: Wiktionary

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Di`a*pa"son, n. Etym: [L., fr. Gr. i. e., diapason. Cf. Panacea.]

1. (Gr. Mus.)

Definition: The octave, or interval which includes all the tones of the diatonic scale.

2. Concord, as of notes an octave apart; harmony. The fair music that all creatures made . . . In perfect diapason. Milton.

3. The entire compass of tones. Through all the compass of the notes it ran, The diapason closing full in man. Dryden.

4. A standard of pitch; a tuning fork; as, the French normal diapason.

5. One of certain stops in the organ, so called because they extend through the scale of the instrument. They are of several kinds, as open diapason, stopped diapason, double diapason, and the like.

Source: Webster’s Unabridged Dictionary 1913 Edition

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