[ foh-toh-kuh-tal-i-sis ]
/ ˌfoʊ toʊ kəˈtæl ɪ sɪs /

noun, plural pho·to·ca·tal·y·ses [foh-toh-kuh-tal-i-seez] /ˌfoʊ toʊ kəˈtæl ɪˌsiz/. Chemistry.

the acceleration or retardation of the reaction rate in chemical reactions by light.


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Take this quiz to see if you really know the difference between “compliment” and “complement"!
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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.

Origin of photocatalysis

First recorded in 1910–15; photo- + catalysis

OTHER WORDS FROM photocatalysis

pho·to·cat·a·lyt·ic [foh-toh-kat-l-it-ik] /ˌfoʊ toʊˌkæt lˈɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for photocatalysis

/ (ˌfəʊtəʊkəˈtælɪsɪs) /

noun plural -ses (-siːz)

the alteration of the rate of a chemical reaction by light or other electromagnetic radiation
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