from
The Collaborative International Dictionary of English v.0.48
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]