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opacity

[oh-pas-i-tee] /oʊˈpæs ɪ ti/
noun, plural opacities.
1.
the state or quality of being opaque.
2.
something opaque.
3.
the degree to which a substance is opaque; capacity for being opaque.
4.
Photography. the proportion of the light that is absorbed by the emulsion on any given area of a film or plate.
5.
obscurity of meaning.
6.
mental dullness.
7.
Medicine/Medical. an opaque spot or area in normally clear or transparent tissue, as a cataract of the eye.
Origin
1550-1560
1550-60; < Latin opācitās shade. See opaque, -ity
Related forms
nonopacity, noun, plural nonopacities.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for opacities

opacity

/əʊˈpæsɪtɪ/
noun (pl) -ties
1.
the state or quality of being opaque
2.
the degree to which something is opaque
3.
an opaque object or substance
4.
obscurity of meaning; unintelligibility
5.
(physics, photog) the ratio of the intensity of light incident on a medium, such as a photographic film, to that transmitted through the medium
6.
(logic, philosophy) the property of being an opaque context
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for opacities

opacity

n.

1550s, "darkness of meaning, obscurity," from French opacité, from Latin opacitatem (nominative opacitas) "shade, shadiness," from opacus "shaded, dark, opaque" (see opaque). The literal sense "condition of being impervious to light" first recorded 1630s.

Online Etymology Dictionary, © 2010 Douglas Harper
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opacities in Medicine

opacity o·pac·i·ty (ō-pās'ĭ-tē)
n.

  1. The quality or state of being opaque.

  2. An opaque or nontransparent area, as of the cornea.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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13
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