[ hey-ley-shuh n, ha- ]
/ heɪˈleɪ ʃən, hæ- /

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.

Words nearby halation

Origin of halation

First recorded in 1855–60; hal(o) + -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for halation

British Dictionary definitions for halation

/ (həˈleɪʃən) /


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

Medicine definitions for halation

[ hā-lāshən ]


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.