Diapa'son (Gr.), a term in music by which the ancient Greeks designated the octave. The French use the term as equivalent to pitch. Diapason is also the English name given to the fundamental stops of the Organ (q.v.).
Diapa'son
Chambers's Encyclopaedia, Volume 3: Catarrh to Dion, p. 793
Source scan(s): p. 0806