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A removable cover, or a gate, for closing an aperture of any kind, as for closing the passageway for molten iron from a ladle.

A small aperture through which objects are to be seen, and by which their direction is settled or ascertained; as, the sight of a quadrant. Thier eyes of fire sparking through sights of steel. Shak.

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.

A cover which opens or closes an aperture by sliding over it.

A narrow depression, perforation, or aperture; esp., one for the reception of a piece fitting or sliding in it.

Any small aperture or vent for air or other fluid.

One of the apertures of the pulmonary sacs of arachnids. See Illust. of Scorpion.

One of the minute apertures between the cells in many serous membranes.

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

To close, as an aperture, by filling or by obstructing; as, to stop the ears; hence, to stanch, as a wound. Shak.

as, the subnasal point, or the middle point of the inferior border of the anterior nasal aperture.

The aperture in a block through which the rope reeves. Ham. Nav. Encyc. Swallow plover (Zoöl.), any one of several species of fork-tailed ploverlike birds of the genus Glareola, as G. orientalis of India; a pratincole. -- Swallow shrike (Zoöl.), any one of several species of East Indian and Asiatic birds of the family…

A hole; an aperture. [Obs.]

A smooth triangular area on the inner surface of the bladder, limited by the apertures of the ureters and urethra.

An aperture in a tromp.

mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a horny multispiral operculum.

e; to scintillate. These stars not twinkle when viewed through telescopes that have large apertures. Sir I. Newton. The western sky twinkled with stars. Sir W. Scott.

Either one of the two apertures in the calamus of a feather.

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.

A small aperture; a hole or passage for air or any fluid to escape; as, the vent of a cask; the vent of a mold; a volcanic vent. Look, how thy wounds do bleed at many vents. Shak. Long't was doubtful, both so closely pent, Which first should issue from the narrow vent. Pope.