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apertural

 - 4 dictionary results

ap⋅er⋅ture

  [ap-er-cher]
Use apertural in a Sentence
–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.
Origin:
1400–50; late ME < L apertūra an opening, equiv. to apert(us) opened (ptp. of aperīre; aper(i)- (see aperient ) + -tus ptp. suffix) + -ūra -ure

Related forms:
ap⋅er⋅tur⋅al  [ap-er-choor-uhl] , adjective
ap⋅er⋅tured, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To apertural
ap·er·ture   (āp'ər-chər)   
n.  

  1. An opening, such as a hole, gap, or slit.

    1. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.

    2. The diameter of such an opening, often expressed as an f-number.

    3. The diameter of the objective of a telescope.


[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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Medical Dictionary

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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Medical Dictionary

aperture ap·er·ture (āp'ər-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.

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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