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[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.
1855-60; hal(o) + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for halation
  • halation is the fog or halo in a photograph around the image of a highly reflective surface or light source.
  • In- halation of manganese oxides or salts can result in chronic toxicity.
British Dictionary definitions for halation


(photog) fogging usually seen as a bright ring surrounding a source of light: caused by reflection from the back of the film
Word Origin
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
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halation in Medicine

halation ha·la·tion (hā-lā'shən)

  1. Blurring of the visual image due to glare from strong illumination.

  2. 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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