D defs.my
Entry 2 senses · 2 variants Webster, 1913

Acoustic

/(#; 277)/ · A·cous·tic · IPA /əˈkuː.stɪk/
01 a. Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
  1. 1.
    Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
Phrases & compounds
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.
02 n. A medicine or agent to assist hearing.
  1. 1.
    A medicine or agent to assist hearing.