reactant

reactant definition - medical

re·ac·tant (rē-ăkˈtənt)

noun
A substance participating in a chemical reaction, especially a directly reacting substance present at the start of the reaction.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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