Echometer
Pronunciation : E*chom"e*ter
Part of Speech : n.
Etymology : [Gr. -meter: cf. F. ?chom?tre.] (Mus)
Definition : Defn: A graduated scale for measuring the duration of sounds, and determining their different, and the relation of their intervals. J. J. Rousseau.
Source : Webster's Unabridged Dictionary, 1913