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Acous"tics (; 277), 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. Acoustics, then, or the science of sound, is a very considerable branch of physics. Sir J. Herschel. 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.
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