aperture-stop
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. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To aperture-stop
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Aperture-stop
is always a great word to know.
So is lollapalooza. Does it mean:
| a gadget; dingus; thingumbob. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
Collins
World English Dictionary
aperture (ˈæpətʃə) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| 1. | a hole, gap, crack, slit, or other opening |
| 2. | physics |
| a. a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it | |
| b. See also relative aperture the diameter of such an opening | |
| [C15: from Late Latin apertūra opening, from Latin aperīre to open] | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
aperture
1640s, from L. apertura "an opening," from apertus, pp. of aperire "to open" (see overt).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
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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Nearby Words
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