Pronunciation: (u-kOO'stik), [key]
1. pertaining to the sense or organs of hearing, to sound, or to the science of sound.
2. (of a building material) designed for controlling sound.
a. of, pertaining to, or being a musical instrument whose sound is not electrically enhanced or modified.
b. arranged for or made up of such instruments: an acoustic solo; an acoustic group.
Obs.a remedy for deafness or imperfect hearing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.