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aperture - 7 dictionary results
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ap⋅er⋅ture
[ap-er-cher] 
ər
–noun
| 1. | an opening, as a hole, slit, crack, gap, etc. |
| 2. | Also called aperture stop. Optics. an opening, usually circular, that limits the quantity of light that can enter an optical instrument. |
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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|
Link To aperture
| ap·er·ture (āp'ər-chər) n.
[Middle English, from Latin apertūra, from apertus, past participle of aperīre, to open; see wer-4 in Indo-European roots.] ap'er·tur'al adj. |
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Aperture
Ap"er*ture\ (?; 135), n. [L. apertura, fr. aperire. See Aperient.]1. The act of opening. [Obs.] 2. 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. 3. (Opt.) 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[deg] aperture.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Language Translation for : aperture
Spanish:
abertura,
German:
die Öffnung,
Japanese:
開き口
Online Etymology Dictionary, © 2001 Douglas Harper
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Main Entry: ap·er·ture
Pronunciation: 'ap-&(r)-"chu(&)r, -ch&r, -"t(y)u(&)r
Function: noun
1 : an opening or open space
2 : the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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aperture ap·er·ture (āp'ər-chər)
n.
- An opening, such as a hole, gap, or slit.
- A usually adjustable opening in an optical instrument, such as a microscope, a camera, or a telescope, that limits the amount of light passing through a lens or onto a mirror.
- The diameter of such an opening.
- The diameter of the objective of a telescope or microscope.
ap'er·tur'al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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aperture
in optics, the maximum diameter of a light beam that can pass through an optical system. The size of an aperture is limited by the size of the mount holding the optical component, or the size of the diaphragm placed in the bundle of light rays. The hole in the mount or diaphragm that limits the size of the aperture is called an aperture stop. Thus, an aperture stop determines the amount of light that traverses an optical system and hence determines the image illumination
Learn more about aperture with a free trial on Britannica.com.
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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