acoustic

/ษ™หˆkuหstษชk/
noun
  1. 1

    A medicine or other agent to assist hearing.

adjective
  1. 1

    Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.

  2. 2

    Naturally producing or produced by an instrument without electrical amplification, as an acoustic guitar or acoustic piano.

noun
  1. 1

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

Source: https://en.wiktionary.org/wiki/acoustic, https://en.wiktionary.org/wiki/acoustic%20guitar