|
Search over 100 encyclopedias and dictionaries: |
Research categories | Follow us on Twitter |
Research categories
View all topics in the newsView all reference sources at Encyclopedia.com |
|||
aperture
aperture
1. (window) The portion of a data record which is selected for specifying operators for use on the data set, e.g. operators such as autocorrelation functions and filters are applied by apertures on seismic records. 2. In a mollusc (Mollusca) shell, the opening through which the soft parts of the animal emerge. It is often a simple, circular opening, but is modified in some genera. In gastropods (Gastropoda), where the aperture is circular or elliptical it is said to be ‘holostomatous’ or ‘entire’; where it is notched (to accommodate a siphon) it is said to be ‘siphonostomatous’. In cephalopods (Cephalopoda), the aperture may be indented or notched at the ventral margin by a hyponomic sinus, which houses the hyponome. Some compressed ammonites (Ammonoidea) possess a pair of lateral shell extensions (lappets) on either side of the aperture. |
|
|
Cite this article
AILSA ALLABY and MICHAEL ALLABY. "aperture." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "aperture." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O13-aperture.html AILSA ALLABY and MICHAEL ALLABY. "aperture." A Dictionary of Earth Sciences. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-aperture.html |
|
aperture
aperture In photography, a hole that allows light to pass through the lens onto the film. Modern cameras usually have a diaphragm aperture which works like the iris of a human eye. The photographer can widen or narrow the diaphragm according to a series of points on the lens dial called ‘f-numbers’ or ‘f-stops’. The individual f-numbers represent the focal length of the lens divided by the diameter of the aperture. As the aperture narrows, it gives a longer depth of field.
|
|
|
Cite this article
"aperture." World Encyclopedia. 2005. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. "aperture." World Encyclopedia. 2005. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O142-aperture.html "aperture." World Encyclopedia. 2005. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-aperture.html |
|
aperture
ap·er·ture / ˈapərˌchər/ • n. chiefly technical an opening, hole, or gap: the bell ropes passed through apertures in the ceiling. ∎ a space through which light passes in an optical or photographic instrument, esp. the variable opening by which light enters a camera. |
|
|
Cite this article
"aperture." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. "aperture." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O999-aperture.html "aperture." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-aperture.html |
|
aperture
aperture The diameter of the main lens or mirror of a telescope, or, in radio astronomy, of the collecting dish. For Schmidt cameras, however, it is the diameter of the corrector plate. See also Unfilled Aperture.
|
|
|
Cite this article
"aperture." A Dictionary of Astronomy. 1997. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. "aperture." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O80-aperture.html "aperture." A Dictionary of Astronomy. 1997. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-aperture.html |
|
aperture
|
|
|
Cite this article
JAMES STEVENS CURL. "aperture." A Dictionary of Architecture and Landscape Architecture. 2000. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. JAMES STEVENS CURL. "aperture." A Dictionary of Architecture and Landscape Architecture. 2000. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O1-aperture.html JAMES STEVENS CURL. "aperture." A Dictionary of Architecture and Landscape Architecture. 2000. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O1-aperture.html |
|
aperture
aperture XV. — L. apertūra, f. apert-, pp. stem of aperīre; see prec., -URE.
|
|
|
Cite this article
T. F. HOAD. "aperture." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "aperture." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O27-aperture.html T. F. HOAD. "aperture." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-aperture.html |
|
aperture
aperture
•botcher, gotcha, top-notcher, watcher, wotcha
•imposture, posture
•firewatcher • birdwatcher
•debaucher, scorcher, torture
•Boucher, voucher
•cloture, encroacher, poacher, reproacher
•jointure • moisture
•cachucha, future, moocher, smoocher, suture
•butcher
•kuccha, scutcher, toucher
•structure
•culture, vulture
•conjuncture, juncture, puncture
•rupture • sculpture • viniculture
•agriculture • sericulture
•arboriculture • pisciculture
•horticulture • silviculture
•subculture • counterculture
•aquaculture • acupuncture
•substructure • infrastructure
•candidature • ligature • judicature
•implicature
•entablature, tablature
•prelature • nomenclature • filature
•legislature • musculature
•premature • signature • aperture
•curvature
•lurcher, nurture, percher, searcher
|
|
|
Cite this article
"aperture." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. "aperture." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O233-aperture.html "aperture." Oxford Dictionary of Rhymes. 2007. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O233-aperture.html |
|
Search over 100 encyclopedias and dictionaries:
HighBeam™ Research, Inc. © Copyright 2012. All rights reserved.
The Encyclopedia.com advertising network includes:
