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.
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.