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halation

[ hey-ley-shuhn, ha- ]
/ heɪˈleɪ ʃən, hæ- /
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noun Photography.
a blurred effect around the edges of highlight areas in a photographic image caused by reflection and scattering of light through the emulsion from the back surface of the film support or plate.
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Origin of halation

First recorded in 1855–60; hal(o) + -ation

Words nearby halation

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use halation in a sentence

British Dictionary definitions for halation

halation
/ (həˈleɪʃən) /

noun
photog fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film

Word Origin for halation

C19: from halo + -ation
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

Medical definitions for halation

halation
[ hā-lāshən ]

n.
Blurring of the visual image due to glare from strong illumination.
A blurring or spreading of light around bright areas on a photographic image.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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