Definition of halation in English:

halation

Syllabification: ha·la·tion
Pronunciation: /hāˈlāSHən
 
/

noun

The spreading of light beyond its proper boundaries to form a fog around the edges of a bright image in a photograph or on a television screen.
More example sentences
  • If these are indeed the causes of halation, then I see no reason why halation should not also take place in a paper emulsion.
  • The Sabatier edge effects, which appear as white lines between areas of distinctly different densities, were proven (by Stevens and Norrish in 1937) to be the result of diffusion halation.
  • This gives normal contrast range with highlight halation.

Origin

mid 19th century: formed irregularly from halo + -ation.

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