photoactivation

[foh-toh-ak-tuh-vey-shuhn]
noun Chemistry.
the activation or control of a chemical, chemical reaction, or organism by light, as the activation of chlorophyll by sunlight during photosynthesis.

Origin:
1920–25; photo- + activation

photoactive, adjective
photoactivity, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Photoactivation begins when the suspension is exposed to a prescribed amount of ultraviolet-A light.
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