echometer [
e'kɔmitə]
[医] 听诊器
Echometer \E*chom"e*ter\, n. [Gr. ?, ?, sound + -meter: cf. F.
['e]chom[`e]tre.] (Mus)
A graduated scale for measuring the duration of sounds, and
determining their different, and the relation of their
intervals. --J. J. Rousseau.