the branch of chemistry that deals with the chemical action of light.

1865–70; photo- + chemistry

photochemical [foh-toh-kem-i-kuhl] , photochemic, adjective
photochemically, adverb
photochemist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photochemistry (ˌfəʊtəʊˈkɛmɪstrɪ)
Also called: actinochemistry the branch of chemistry concerned with the chemical effects of light and other electromagnetic radiations

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

photochemistry pho·to·chem·is·try (fō'tō-kěm'ĭ-strē)
The branch of chemistry that deals with the effects of light on chemical systems.

pho'to·chem'i·cal (-ĭ-kəl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
photochemistry   (fō'tō-kěm'ĭ-strē)  Pronunciation Key 
The scientific study of the effects of light and ultraviolet radiation on chemical reactions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Photochemistry can be manipulated by orbital symmetry.
The general name of the branch of chemistry is photochemistry.
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