[hey-ley-shuhn, ha-]
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

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World English Dictionary
halation (həˈleɪʃən)
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 & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
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.
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