from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Chemical breakdown caused by radiant energy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any photochemical reaction that results in the decomposition of a substance
from The Century Dictionary and Cyclopedia
- n. In photography, chemical change effected by light; specifically, the action of light on a sensitive surface or in a film.
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