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The Collaborative International Dictionary of English v.0.48 (gcide)

Acoustic \A*cous"tic\, n.
A medicine or agent to assist hearing.
[1913 Webster]


Acoustic \A*cous"tic\ (#; 277), a. [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.
[1913 Webster]

{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.
[1913 Webster]