microcoustic

from The Collaborative International Dictionary of English v.0.48
Microcoustic \Mi`cro*cous"tic\, a. [Micro- + acoustic: cf. F.
   microcoustique, micracoustique.]
   Pertaining, or suited, to the audition of small sounds;
   fitted to assist hearing.
   [1913 Webster]
from The Collaborative International Dictionary of English v.0.48
Microcoustic \Mi`cro*cous"tic\, n.
   An instrument for making faint sounds audible, as to a
   partially deaf person.
   [1913 Webster]
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