otacoustic
Ot`a*cous"tic, a. Etym: [Oto- + acoustic: cf. F. otacoustique.] Defn: Assisting the sense of hearing; as, an otacoustic instrument. Ot`a*cous"tic, Ot`a*cous"ti*con, n. Defn: An instrument to facilitate hearing, as an ear trumpet.
Ot`a*cous"tic, a. Etym: [Oto- + acoustic: cf. F. otacoustique.] Defn: Assisting the sense of hearing; as, an otacoustic instrument. Ot`a*cous"tic, Ot`a*cous"ti*con, n. Defn: An instrument to facilitate hearing, as an ear trumpet.