photoactivation

[foh-toh-ak-tuh-vey-shuhn]

pho·to·ac·ti·va·tion

[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

pho·to·ac·tive, adjective
pho·to·ac·tiv·i·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Photoactivation is always a great word to know.
So is halogen. Does it mean:
existing as free, uncombined atoms
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals
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