ETYM French acoustique, Greek akoustikos relating to hearing, from akouein to hear.
Of or relating to the science of acoustics; SYN. acoustical.
Pertaining to the hearing, to sound and its transmission; worked by sound or echoes.

A remedy for hearing loss or deafness.
Term describing a musical instrument played without electrical amplification or assistance, for example an acoustic guitar or acoustic piano. It is also a term used by musicians to characterize room response, an important factor in performance. A so-called “bright” acoustic provides a lively reverberation while a “dry” or “muddy” acoustic is lacking in response; see acoustics.