Acoustic duct, the auditory duct, or external passage of the ear.Acoustic telegraph, a telegraph making audible signals; a telephone.Acoustic vessels, brazen tubes or vessels, shaped like a bell, used in ancient theaters to propel the voices of the actors, so as to render them audible to a great distance.

(A*cous"tic), n. A medicine or agent to assist hearing.

(A*cous"tic*al) a. Of or pertaining to acoustics.

(A*cous"tic*al*ly) adv. In relation to sound or to hearing. Tyndall.

(Ac`ous*ti"cian) n. One versed in acoustics. Tyndall.

(A*cous"tics) 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.

3. (Zoöl.) See Acorn- shell.

Acorn cup
(A"corn cup) The involucre or cup in which the acorn is fixed.

(A"corned) a.

1. Furnished or loaded with acorns.

2. Fed or filled with acorns. [R.] Shak.

(A"corn-shell`) n. (Zoöl.) One of the sessile cirripeds; a barnacle of the genus Balanus. See Barnacle.

(A*cos"mism) n. [Gr. 'a priv. + world.] A denial of the existence of the universe as distinct from God.

(A*cos"mist) n. [See Acosmism.] One who denies the existence of the universe, or of a universe as distinct from God. G. H. Lewes.

(A*cot`y*le"don) n. [Gr. 'a priv. + anything cup-shaped. See Cotyledon.] (Bot.) A plant which has no cotyledons, as the dodder and all flowerless plants.

(A*cot`y*led"on*ous) a. Having no seed lobes, as the dodder; also applied to plants which have no true seeds, as ferns, mosses, etc.

(A*cou"chy) n. [F. acouchi, from the native name Guiana.] (Zoöl.) A small species of agouti

(A*cou"me*ter) n. [Gr. to hear + -meter.] (Physics.) An instrument for measuring the acuteness of the sense of hearing. Itard.

(A*cou"me*try) n. [Gr. to hear + -metry.] The measuring of the power or extent of hearing.

(A*cous"tic) a. [F. acoustique, Gr. relating to hearing, fr. to hear.] Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory.

  By PanEris using Melati.

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