aperture
Definition from Wiktionary, a free dictionary
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[edit] English
[edit] Etymology
Latin apertura (“‘opening’”) < apertus, pp. of aperire (“‘to open, uncover’”), opposed to operire (“‘to close, cover’”). See aperient.
[edit] Pronunciation
[edit] Noun
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Singular |
Plural |
aperture (plural apertures)
- 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.
- (optics) Something which restricts the diameter of the light path through one plane in an optical system.
- (astronomy, photography) The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100 cm aperture.
[edit] Usage notes
The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.
[edit] Related terms
[edit] Translations
opening
something which restricts the diameter of the light path through one plane in an optical system
diameter of the aperture (in the sense above)
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Translations to be checked
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[edit] External links
- aperture in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- aperture in The Century Dictionary, The Century Co., New York, 1911
[edit] Italian
[edit] Noun
aperture f.
- Plural form of apertura.
