TETRADIAP'ASON, noun [Gr. four, and diapason.] Quadruple diapason or octave; a musical chord, otherwise called a quadruple eighth or twenty ninth.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI
tetradiapason
Founding-era definition · Webster's 1828 American Dictionary
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