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Definition of Photocatalyst
1. Noun. (chemistry) A substance that absorbs light and, in doing so, catalyzes a reaction. ¹
¹ Source: wiktionary.com
Medical Definition of Photocatalyst
1. A substance that helps bring about a light-catalyzed reaction; e.g., chlorophyll. Origin: photo-+ G. Katalysis, dissolution (catalysis) (05 Mar 2000)