photo reaction

photoreaction

[foh-toh-ree-ak-shuhn]
noun Chemistry.
a chemical reaction that involves or requires light.

Origin:
1905–10; photo- + reaction

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Medical Dictionary

photoreaction pho·to·re·ac·tion (fō'tō-rē-āk'shən)
n.
A photochemical reaction.

The American Heritage® Stedman's Medical Dictionary
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