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otacoustic
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| otalgia
otacoustic
CIDE DICTIONARY
otacoustic, a. [Oto- + acoustic: cf. F. otacoustique.].
Assisting the sense of hearing; as, an otacoustic instrument. [1913 Webster]
otacoustic, n.
An instrument to facilitate hearing, as an ear trumpet. [1913 Webster]
For further exploring for "otacoustic" in Webster Dictionary Online
