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Webster 1913 Edition

Adj.

[

Oto-

acoustic

: cf. F.

otacoustique

Assisting the sense of hearing;

as, an

otacoustic

instrument

Adj.

[Gr. ears, and to hear.] Assisting the sense of hearing; as an otacoustic instrument.

Noun.

An instrument to facilitate hearing.

otacoustic ‎(not comparable)

otacoustic ‎(plural otacoustics)