(manner) In an acoustic manner, or using an acoustic musical instrument. / (domain) From the perspective of acoustics.

Of or pertaining to hearing or acoustics.

(physics) The science of sounds, teaching their nature, phenomena and laws.

plural of acoustic

(architecture) (of building materials) Used for soundproofing or modifying sound. / (of a device or system) Utilizing sound energy in its operation.

(usually in the plural) The properties or qualities of a room or building that determine how sound is transmitted in it. / (medicine) A medicine or other agent to assist hearing.

The condition of being acoustic

A hollow-body guitar of the older variety, in contradistinction to an electric guitar.

A benign tissue growth situated in the hearing canal.

(quantum mechanics) the study of the effects of the laws of quantum mechanics on the propagation and absorption of sound