Science Fair Project Dictionary
Aperture
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English
Etymology
Latin apertura , from aperire. See Aperient.
Pronunciation
- IPA: /ˈæpətʃʊə, ˈæpətʃə/
- IPA: WEAE /ˈæp.ɚ.tʃɚ/
Noun
- 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) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
Note: 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.
10-26-2009 07:45:12
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details