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otacoustic
From The Collaborative International Dictionary of English v.0.48:
otacoustic \ot`a*cous"tic\, otacousticon \ot`a*cous"ti*con\, n. An instrument to facilitate hearing, as an ear trumpet. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
otacoustic \ot`a*cous"tic\, a. [Oto- + acoustic: cf. F. otacoustique.] Assisting the sense of hearing; as, an otacoustic instrument. [1913 Webster] otacoustic
