A*cous"tic [F. acoustique, Gr. relating to hearing, fr. to hear.]
Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.
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.
© Webster 1913.
A*cous"tic, n.
A medicine or agent to assist hearing.
© Webster 1913.