A passive device for reflecting and often focusing sound waves, chiefly used to provide early warning of incoming aircraft (by detecting the sound of their engines).

A background hum or white noise used to mask other potentially distracting sounds.

plural of acoustic meatus

(anatomy) An internal auditory meatus. / (anatomy) An external acoustic meatus.

The symptoms that can be caused by unexpected loud sounds (an acoustic incident) received through a telephone headset.

(military) The deliberate radiation or reradiation of mechanical or electroacoustic signals with the objectives of obliterating or obscuring signals that an enemy is attempting to receive and of disrupting enemy weapons systems.

An interface device for coupling electrical signals by acoustical means. / (dated, telecommunications) A terminal device used to link data terminals and radio sets with the telephone network.

plural of acoustic emission

plural of acoustic coupler

(music, of an acoustic instrument) Modified with the addition of pickups or a microphone, in order to make the sound louder and more noticeable.