Comma, in the mathematical study of sound, is a small interval, generally corresponding to the vibration-ratio 81 : 80, which occurs between the true pitches of two notes, which on the piano, organ, and other tempered instruments, are represented by one only. See TEMPERAMENT.
Comma
Chambers's Encyclopaedia, Volume 3: Catarrh to Dion, p. 379
Source scan(s): p. 0390