ap·er·ture ( p r-ch r)n.1. An opening, such as a hole, gap, or slit. 2. a. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror. b. The diameter of such an opening, often expressed as an f-number. c. The diameter of the objective of a telescope.
[Middle English, from Latin apert ra, from apertus, past participle of aper re, to open; see wer-4 in Indo-European roots.]
ap er·tur al adj. |
aperture Noun 1. a hole or opening 2. an opening in a camera or telescope that controls the amount of light entering it [Latin aperire to open]
ThesaurusLegend: Synonyms Related Words Antonyms | Noun | 1. | aperture - a device that controls amount of light admittedcamera, photographic camera - equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other) regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc. | | 2. | aperture - a natural opening in somethingpupil - the contractile aperture in the center of the iris of the eye; resembles a large black dot hole - an opening into or through something micropyle - minute opening in the wall of an ovule through which the pollen tube enters stoma, stomate, pore - a minute epidermal pore in a leaf or stem through which gases and water vapor can pass | | 3. | aperture - an man-made opening; usually smallmouthpiece - a part that goes over or into the mouth of a person; "the mouthpiece of a respirator" opening - a vacant or unobstructed space that is man-made; "they left a small opening for the cat at the bottom of the door" |
aperture noun opening, space, hole, crack, gap, rent, passage, breach, slot, vent, rift, slit, cleft, eye, chink, fissure, orifice, perforation, eyelet, interstice
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