noun, plural photocatalyses [foh-toh-kuh-tal-i-seez] . Chemistry.
the acceleration or retardation of the reaction rate in chemical reactions by light.

1910–15; photo- + catalysis

photocatalytic [foh-toh-kat-l-it-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photocatalysis (ˌfəʊtəʊkəˈtælɪsɪs)
n , pl -ses
the alteration of the rate of a chemical reaction by light or other electromagnetic radiation

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