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aperture

[ap-er-cher]
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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.
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Origin of aperture

1400–50; late Middle English < Latin apertūra an opening, equivalent to apert(us) opened (past participle of aperīre; aper(i)- (see aperient) + -tus past participle suffix) + -ūra -ure
Related formsap·er·tur·al [ap-er-choo r-uh l] /ˈæp ərˌtʃʊər əl/, adjectiveap·er·tured, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for aperture

aperture

noun
  1. a hole, gap, crack, slit, or other opening
  2. physics
    1. a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it
    2. the diameter of such an openingSee also relative aperture
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Word Origin

C15: from Late Latin apertūra opening, from Latin aperīre to open
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for aperture

n.

early 15c., from Latin apertura "an opening," from apertus, past participle of aperire "to open" (see overt).

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Online Etymology Dictionary, © 2010 Douglas Harper

aperture in Medicine

aperture

(ăpər-chər)
n.
  1. An opening, such as a hole, gap, or slit.
  2. 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.
  3. The diameter of such an opening.
  4. The diameter of the objective of a telescope or microscope.
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Related formsaper•tur′al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.