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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

Related Words for reactants

impetus, motivation, incentive, stimulant, incitement, reactionary, spur, goad, incendiary, agitator, impulse, incitation, reactant, synergist, adjuvant, enzyme, yeast, leaven, ferment

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.