%acoustic%

n. A medicine or agent to assist hearing. [ 1913 Webster ]

a. Of or pertaining to acoustics. [ 1913 Webster ]

adv. In relation to sound or to hearing. Tyndall. [ 1913 Webster ]

n. One versed in acoustics. Tyndall. [ 1913 Webster ]

n. [ Names of sciences in -ics, as, acoustics, mathematics, etc., are usually treated as singular. See -ics. ] (Physics.) The science of sounds, teaching their nature, phenomena, and laws. [ 1913 Webster ]

Acoustics, then, or the science of sound, is a very considerable branch of physics. Sir J. Herschel. [ 1913 Webster ]

☞ The science is, by some writers, divided, into diacoustics, which explains the properties of sounds coming directly from the ear; and catacoustica, which treats of reflected sounds or echoes. [ 1913 Webster ]

n. [ Pref. cata + acoustics: cf. F. caraconstique. ] (Physics) That part of acoustics which treats of reflected sounds or echoes See Acoustics. Hutton.

a. [ Pref. di- + acoustic. ] Pertaining to the science or doctrine of refracted sounds. [ 1913 Webster ]

n. [ Cf. F. diacoustique. ] That branch of natural philosophy which treats of the properties of sound as affected by passing through different mediums; -- called also diaphonics. See the Note under Acoustics.

a. Same as Microustic. [ 1913 Webster ]

a. [ Oto- + acoustic: cf. F. otacoustique. ] Assisting the sense of hearing; as, an otacoustic instrument. [ 1913 Webster ]

{ } n. An instrument to facilitate hearing, as an ear trumpet. [ 1913 Webster ]

a. [ Poly- + acoustic: cf. F. polyacoustique. ] Multiplying or magnifying sound. -- n. A polyacoustic instrument. [ 1913 Webster ]