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Aperture :: Aperture (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture..

Apert :: Apert (a.) Open; evident; undisguised.

Hyperotreta :: Hyperotreta (n. pl.) An order of marsipobranchs, including the Myxine or hagfish and the genus Bdellostoma. They have barbels around the mouth, one tooth on the plate, and a communication between the nasal aperture and the throat. See Hagfish..

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..

Trompil :: Trompil (n.) An aperture in a tromp.

Peritreme :: Peritreme (n.) The edge of the aperture of a univalve shell.

Hiatus :: Hiatus (n.) An opening; an aperture; a gap; a chasm; esp., a defect in a manuscript, where some part is lost or effaced; a space where something is wanting; a break..

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..

Exostome :: Exostome (n.) The small aperture or foremen in the outer coat of the ovule of a plant.

Hourglass :: Hourglass (n.) An instrument for measuring time, especially the interval of an hour. It consists of a glass vessel having two compartments, from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower..

Leak :: Leak (v.) The entrance or escape of a fluid through a crack, fissure, or other aperture; as, the leak gained on the ship's pumps..

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

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

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..

Stigma :: Stigma (v. t.) One of the apertures of the gill of an ascidian, and of Amphioxus..

Flashing :: Flashing (n.) The reheating of an article at the furnace aperture during manufacture to restore its plastic condition; esp., the reheating of a globe of crown glass to allow it to assume a flat shape as it is rotated..

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

Clepsydra :: Clepsydra (n.) A water clock; a contrivance for measuring time by the graduated flow of a liquid, as of water, through a small aperture. See Illust. in Appendix..

Fatiscence :: Fatiscence (n.) A gaping or opening; state of being chinky, or having apertures..

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..

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