in general, denotes any thing that relates to the ear, the sense of hearing, or the doctrine of sounds.

Acoustic Disciples, among the ancient Pythagoreans, those more commonly called Acousmatici.

Acoustic Ducts, in Anatomy, the same with meatus auditorius, or the external passage of the ear.

Acoustic Vessels, in the ancient theatres, were a kind of vessels made of brass, shaped in the bell fashion, which, being of all tones within the pitch of the voice, or even of instruments, rendered the sound more audible, so that the actors could be heard through all parts of theatres which were even 400 feet in diameter.