microcoustic
Mi`cro*cous"tic, a. Etym: [Micro- + acoustic: cf. F. microcoustique, micracoustique.] Defn: Pertaining, or suited, to the audition of small sounds; fitted to assist hearing. Mi`cro*cous"tic, n. Defn: An instrument for making faint sounds audible, as to a partially deaf person.