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pho⋅to⋅ca⋅tal⋅y⋅sis

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

Origin:
1910–15; photo- + catalysis


pho⋅to⋅cat⋅a⋅lyt⋅ic [foh-toh-kat-l-it-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: pho·to·ca·tal·y·sis
Pronunciation: "fOt-O-k&-'tal-&-s&s
Function: noun
Inflected Form: plural pho·to·ca·tal·y·ses /-"sEz/
: the acceleration of a chemical reaction by radiant energy (as light) acting either directly or byexciting a substance that in turn catalyzes the main reaction —compare PHOTOINACTIVATION 1
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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