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microcoustic
CIDE DICTIONARY
microcoustic, a. [Micro- + acoustic: cf. F. microcoustique, micracoustique.].
Pertaining, or suited, to the audition of small sounds; fitted to assist hearing. [1913 Webster]
microcoustic, n.
An instrument for making faint sounds audible, as to a partially deaf person. [1913 Webster]
For further exploring for "microcoustic" in Webster Dictionary Online