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. [ 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.
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