How To Pronounce "Acoustic"

adjectiveAlso a·cous·ti·cal.
pertaining to the sense or organs of hearing, to sound, or to the science of sound.

(of a building material) designed for controlling sound.

Music.

of, relating to, or being a musical instrument whose sound is not electrically enhanced or modified.

arranged for or made up of such instruments:
an acoustic solo; an acoustic group.

noun
Obsolete. a remedy for deafness or imperfect hearing.