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reactant

[ree-ak-tuh nt]
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noun
  1. a person or thing that reacts.
  2. Also called interactant. Chemistry. any substance that undergoes a chemical change in a given reaction.
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Origin of reactant

First recorded in 1925–30; react + -ant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for reactants

reactant

noun
  1. a substance that participates in a chemical reaction, esp a substance that is present at the start of the reactionCompare product (def. 4)
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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

Word Origin and History for reactants

reactant

1901 (n.), 1911 (adj.), from react + -ant.

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Online Etymology Dictionary, © 2010 Douglas Harper

reactants in Medicine

reactant

(rē-ăktənt)
n.
  1. A substance participating in a chemical reaction, especially a directly reacting substance present at the start of the reaction.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

reactants in Science

reactant

[rē-ăktənt]
  1. A substance participating in a chemical reaction, especially one present at the start of the reaction.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.