Definition of aperture

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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..

Lern More About Aperture

Swallowed :: Swallow (n.) The aperture in a block through which the rope reeves.
Stop :: Stop (v. t.) To close, as an aperture, by filling or by obstructing; as, to stop the ears; hence, to stanch, as a wound..
Peristome :: Peristome (n.) The lip, or edge of the aperture, of a spiral shell..
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..
Stop :: Stop (n.) The closing of an aperture in the air passage, or pressure of the finger upon the string, of an instrument of music, so as to modify the tone; hence, any contrivance by which the sounds of a musical instrument are regulated..
Loophole :: Loophole (n.) A hole or aperture that gives a passage, or the means of escape or evasion..
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.
Perforation :: Perforation (n.) A hole made by boring or piercing; an aperture.
Imperforated :: Imperforated (a.) Not perforated; having no opening or aperture.
Wicket :: Wicket (n.) A small gate or door, especially one forming part of, or placed near, a larger door or gate; a narrow opening or entrance cut in or beside a door or gate, or the door which is used to close such entrance or aperture. Piers Plowman..
Operculum :: Operculum (n.) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda..
Spiracular :: Spiracle (n.) Any small aperture or vent for air or other fluid.
Vent :: Vent (n.) 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..
Mask Shell :: Mask shell () Any spiral marine shell of the genus Persona, having a curiously twisted aperture..
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..
Epiphragm :: Epiphragm (n.) A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation..
Vial :: Vial (n.) A small bottle, usually of glass; a little glass vessel with a narrow aperture intended to be closed with a stopper; as, a vial of medicine..
Slide :: Slide (n.) A cover which opens or closes an aperture by sliding over it.
Shutter :: Shutter (n.) A removable cover, or a gate, for closing an aperture of any kind, as for closing the passageway for molten iron from a ladle..
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