A·cous'tic, a.

(-kow'stik), a. [N. Lat. acusticus, Fr. acoustique, Gr. ἀκουστικός, from ἀκούειν, to hear.] Pertaining to the ears, to the sense of hearing, or to the doctrine of sounds.

Acoustic vessels, brazen tubes or vessels, shaped like a bell, used in ancient theaters to propel the voice of the actors, so as to render them audible to a great distance.