Noah Webster
Otacoustic
OTACOUS'TIC, adjective [Gr. ears, and to hear.] Assisting the sense of hearing; as an otacoustic instrument.
OTACOUS'TIC, noun An instrument to facilitate hearing.
OTACOUS'TIC, adjective [Gr. ears, and to hear.] Assisting the sense of hearing; as an otacoustic instrument.
OTACOUS'TIC, noun An instrument to facilitate hearing.