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An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. An aperture between the mountains. Gilpin. The back aperture of the nostrils. Owen.

haracter; as, remarkably angular in his habits and appearance; an angular female. Angular aperture, Angular distance. See Aperture, Distance. -- Angular motion, the motion of a body about a fixed point or fixed axis, as of a planet or pendulum. It is equal to the angle passed over at the point or axis by a line drawn…

The act of opening; an opening; an aperture. [Archaic] Wiseman.

A group of Turbellaria in which there is no anal aperture.

p includes, social, and compound species. The gill is a netlike structure within the oral aperture. The integument is usually leathery in texture. See Illustration in Appendix.

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.

An aperture, with a wooden shutter, in the wall of a house, for giving, occasionally, air or light; also, a small closet. [Scot.] Open the bole wi'speed, that I may see if this be the right Lord Geraldin. Sir W. Scott.

harged. It consists essentially of a graduated glass tube, usually furnished with a small aperture and stopcock.

ne Bryozoa, mostly with calcareous shells. They have a movable lip and a lid to close the aperture of the cells. [Also written Chillostomata.]

ard. -- Chimney cap, a device to improve the draught of a chimney, by presenting an exit aperture always to leeward. -- Chimney corner, the space between the sides of the fireplace and the fire; hence, the fireside. -- Chimney hook, a hook for holding pats and kettles over a fire, -- Chimney money, hearth money, a d…

ivance for measuring time by the graduated flow of a liquid, as of water, through a small aperture. See Illust. in Appendix.

prohibited by law. -- Close vowel (Pron.), a vowel which is pronounced with a diminished aperture of the lips, or with contraction of the cavity of the mouth. -- Close to the wind (Naut.), directed as nearly to the point from which the wind blows as it is possible to sail; closehauled; -- said of a vessel.…

ssions; 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.

ion (Med.), the act or the result of applying a counter irritant. -- Counter opening, an aperture or vent on the opposite side, or in a different place. -Counter parole (Mil.), a word in addition to the password, given in time of alarm as a signal. -- Counter plea (Law), a replication to a plea. Cowell. -- Counter p…

A division of Bryozoa, in which the cells have circular apertures.

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.