n.
Pronunciation: ə - ' küs-tik
Variant: or acous · ti · cal \ -ti-k ə l \
Function: adjective
Etymology: Greek akoustikos of hearing, from akouein to hear ― more at HEAR
Date: 1605
1 : of or relating to the sense or organs of hearing, to sound, or to the science of sounds < acoustic apparatus of the ear> < acoustic energy>: as a : deadening or absorbing sound < acoustic tile> b : operated by or utilizing sound waves
2 : of, relating to, or being a musical instrument whose sound is not electronically modified
– acous · ti · cal · ly \ -k( ə -)l ē \ adverb