aperture
[ ap-er-cher ]
/ ˈæp ər tʃər /
noun
an opening, as a hole, slit, crack, gap, etc.
Also called aperture stop. Optics. an opening, usually circular, that limits the quantity of light that can enter an optical instrument.
Nearby words
Origin of aperture
Related forms
ap·er·tur·al [ap-er-choo r-uh l] /ˈæp ərˌtʃʊər əl/, adjectiveap·er·tured, adjectiveDictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for aperture
British Dictionary definitions for aperture
aperture
/ (ˈæpətʃə) /
noun
a hole, gap, crack, slit, or other opening
physics
- a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it
- the diameter of such an openingSee also relative aperture
Word Origin for aperture
C15: from Late Latin apertūra opening, from Latin aperīre to open
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Medicine definitions for aperture
aperture
[ ăp′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.
Related forms
ap′er•tur′al adj.The American Heritage® Stedman's Medical Dictionary
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