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Acoustic

a.
  1. Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
    2. Acoustic duct ,
    the auditory duct, or external passage of the ear.
    Acoustic telegraph ,
    a telegraph making audible signals; a telephone.
    Acoustic vessels ,
    brazen tubes or vessels, shaped like a bell, used in ancient theaters to propel the voices of the actors, so as to render them audible to a great distance.

n.
  1. A medicine or agent to assist hearing.