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opacity

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o⋅pac⋅i⋅ty

  [oh-pas-i-tee]
Use opacity in a Sentence
–noun, plural -ties.
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:
1550–60; < L opācitās shade. See opaque, -ity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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o·pac·i·ty   (ō-pās'ĭ-tē)   
n.   pl. o·pac·i·ties

  1. The quality or state of being opaque.

  2. Something opaque.

    1. Obscurity; impenetrability.

    2. Dullness of mind.


[French opacité, from Old French, from Latin opācitās, from opācus, dark.]
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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Word Origin & History

opacity 
1560, "darkness of meaning, obscurity," from Fr. opacité, from L. opacitatem (nom. opacitas) "shade, shadiness," from opacus "shaded, dark, opaque." The lit. sense "condition of being impervious to light" first recorded 1634.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: opac·i·ty
Pronunciation: O-'pas-&t-E
Function: noun
Inflected Form: plural -ties
1 : the quality orstate of a body that makes it impervious to the rays of light; broadly : the relative capacity of matter to obstruct by absorption or reflection the transmission of radiant energy (asx-radiation, radio waves, infrared radiation, or sound)
2 : an opaque spot in a normally transparent structure (as the lens of the eye)
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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