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1. A blurring or spreading of light around bright areas on a photographic image.
2. A glow around a bright object on a television screen.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Photography) photog fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film
[C19: from halo + -ation]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ha•la•tion(heɪˈleɪ ʃən, hæ-)
a blurred effect around the edges of highlight areas in a photographic image.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.