otoacoustic

o·to·a·cous·tic

(ō'tō-a-kū'stik), Referring to the emission of very faint sounds produced by the ear; thought to represent mechanical vibrations in the cochlea.

otoacoustic

(ō″tō-ă-koo′stĭk) [″ + ″] 1. Pert. to or aiding hearing. 2. A device to aid hearing; an ear trumpet.