acoustic
/əˈkuːstɪk/
/əˈkuːstɪk/
noun
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A medicine or other agent to assist hearing.
adjective
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Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
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Naturally producing or produced by an instrument without electrical amplification, as an acoustic guitar or acoustic piano.
noun
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(retronym) A hollow-body guitar of the older variety, in contradistinction to an electric guitar.