• synonyms


  1. the branch of chemistry that deals with the chemical action of light.
Show More

Origin of photochemistry

First recorded in 1865–70; photo- + chemistry
Related formspho·to·chem·i·cal [foh-toh-kem-i-kuh l] /ˌfoʊ toʊˈkɛm ɪ kəl/, pho·to·chem·ic, adjectivepho·to·chem·i·cal·ly, adverbpho·to·chem·ist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for photochemistry

Historical Examples

  • It is agreed by scientists that photochemistry has a promising future.

    Artificial Light

    M. Luckiesh

British Dictionary definitions for photochemistry


  1. the branch of chemistry concerned with the chemical effects of light and other electromagnetic radiationsAlso called: actinochemistry
Show More
Derived Formsphotochemist, 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

photochemistry in Medicine


  1. The branch of chemistry that deals with the effects of light on chemical systems.
Show More
Related formspho′to•chemi•cal (-ĭ-kəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

photochemistry in Science


  1. The scientific study of the effects of light and ultraviolet radiation on chemical reactions.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.