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Having the lips, or edges, of the aperture abruptly spreading; -- said of certain shells.

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

Applied to the veins which pass out of the cranium through apertures in its walls.

A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or æstivation.

The small aperture or foremen in the outer coat of the ovule of a plant.

A gaping or opening; state of being chinky, or having apertures. Kirwan.

That portion of the interior of a spiral shell which can be seen by looking into the aperture.

A small opening; esp., one of the apertures, closed by membranes, between the tympanum and internal ear.

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.

Peevish; cross; vexatious; quarrelsome. [Obs.] Shak. Is Pompey grown so malapert, so frampel Beau. & Fl.

A disk with a small aperture, to direct the sight forward, and cure squinting.

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.

An artificial division of gastropods, including those that have an entire aperture.

Having an entire aperture; -- said of many univalve shells.

f which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower.

e barbels around the mouth, one tooth on the plate, and a communication between tionnasal aperture and the throat. See Hagfish. [Written also Hyperotreti.]

Not perforated; having no opening or aperture. Sir J. Banks.

The aperture in a mold for pouring in the metal; the gate. Simmonds.

An adjustable diaphragm, suggesting the iris of the eye in its action, for regulating the aperture of a lens, consisting of a number of thin pieces fastened to a ring. It is used in cameras and microscopes.

A hole or apertupe in a door or lock, for receiving a key.