Medical Dictionary

photocatalyst pho·to·cat·a·lyst (fō'tō-kāt'l-ĭst)
A substance that helps bring about a light-catalyzed reaction, such as chlorophyll in photosynthesis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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