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Operculum :: Operculum (n.) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda..

Embrasure :: Embrasure (n.) An aperture with slant sides in a wall or parapet, through which cannon are pointed and discharged; a crenelle. See Illust. of Casemate..

Barker''s Mill :: Barker's mill () A machine, invented in the 17th century, worked by a form of reaction wheel. The water flows into a vertical tube and gushes from apertures in hollow horizontal arms, causing the machine to revolve on its axis..

Apertion :: Apertion (n.) The act of opening; an opening; an aperture.

Bole :: Bole (n.) An aperture, with a wooden shutter, in the wall of a house, for giving, occasionally, air or light; also, a small closet..

Peristome :: Peristome (n.) The lip, or edge of the aperture, of a spiral shell..

Lip :: Lip (n.) One of the edges of the aperture of a univalve shell.

Siphonostomatous :: Siphonostomatous (a.) Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.

Burette :: Burette (n.) An apparatus for delivering measured quantities of liquid or for measuring the quantity of liquid or gas received or discharged. It consists essentially of a graduated glass tube, usually furnished with a small aperture and stopcock..

Resonator :: Resonator (n.) Anything which resounds; specifically, a vessel in the form of a cylinder open at one end, or a hollow ball of brass with two apertures, so contrived as to greatly intensify a musical tone by its resonance. It is used for the study and analysis of complex sounds..

Fauces :: Fauces (n.pl.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.

Rima :: Rima (n.) A narrow and elongated aperture; a cleft; a fissure.

Operculum :: Operculum (n.) Any lid-shaped structure closing the aperture of a tube or shell.

Swallowed :: Swallow (n.) The aperture in a block through which the rope reeves.

Confessional :: Confessional (n.) The recess, seat, or inclosed place, where a priest sits to hear confessions; often a small structure furnished with a seat for the priest and with a window or aperture so that the penitent who is outside may whisper into the priest's ear without being seen by him or heard by others..

Valve :: Valve (n.) A lid, plug, or cover, applied to an aperture so that by its movement, as by swinging, lifting and falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid..

Labrum :: Labrum (n.) The external margin of the aperture of a shell. See Univalve.

Stomatopod :: Stomatoplastic (a.) Of or pertaining to the operation of forming a mouth where the aperture has been contracted, or in any way deformed..

Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..

Aperture :: Aperture (n.) The act of opening.

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