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[foh-toh-kem-uh-stree] /ˌfoʊ toʊˈkɛm ə stri/
the branch of chemistry that deals with the chemical action of light.
Origin of photochemistry
First recorded in 1865-70; photo- + chemistry
Related forms
[foh-toh-kem-i-kuh l] /ˌfoʊ toʊˈkɛm ɪ kəl/ (Show IPA),
photochemic, adjective
photochemically, adverb
photochemist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for photochemical
Historical Examples
  • Scheele's work aroused much interest in photochemical effects and many investigations followed.

    Artificial Light M. Luckiesh
  • The foregoing are only a few of the multitude of photochemical reactions and other effects of radiant energy.

    Artificial Light M. Luckiesh
  • We must therefore conclude that the heliotropic curvature of the polyps is determined by a photochemical action of the light.

  • The product of photochemical decomposition no longer forms azo-colours with amines or phenols.

    Coal Raphael Meldola
British Dictionary definitions for photochemical


of or relating to photochemistry; involving the chemical effects of light
Derived Forms
photochemically, adverb


the branch of chemistry concerned with the chemical effects of light and other electromagnetic radiations Also called actinochemistry
Derived Forms
photochemist, noun
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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photochemical in Medicine

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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photochemical in Science
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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