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reactant

[ree-ak-tuh nt] /riˈæk tənt/
noun
1.
a person or thing that reacts.
2.
Also called interactant. Chemistry. any substance that undergoes a chemical change in a given reaction.
Origin of reactant
1925-1930
1925-30; react + -ant
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for reactant
Historical Examples
  • "Empty the reactant fuel tanks of all but enough for us to raise ship and touch down over to the fairgrounds," said Strong.

  • No matter what distance or reactant I assume, nothing we know will fit.

    Masters of Space Edward Elmer Smith
  • "She's been stripped of her reactant pile, Major," said Strong.

    The Revolt on Venus Carey Rockwell
  • "reactant feeding at D-9 rate," said Barret after a split-second pause.

    Sabotage in Space Carey Rockwell
  • What kind of reactant is Quent Miles using in that ship of yours?

    Treachery in Outer Space Carey Rockwell and Louis Glanzman
  • At a D-9 rate the reactant is hot enough to create power for normal flight.

    Treachery in Outer Space Carey Rockwell and Louis Glanzman
  • Four hours later Loring and Mason came out of the reactant chamber carrying a small lead box.

    Danger in Deep Space Carey Rockwell
  • I don't know who's going to be first, but I can't even strip my ship by tomorrow morning, let alone soup up the reactant.

    Treachery in Outer Space Carey Rockwell and Louis Glanzman
  • If you return here with less than a quarter supply of reactant fuel, you will be disqualified.

    Treachery in Outer Space Carey Rockwell and Louis Glanzman
  • And far below on the power deck, Astro began to feed the reactant energy into the firing chambers.

    The Space Pioneers Carey Rockwell
British Dictionary definitions for reactant

reactant

/rɪˈæktənt/
noun
1.
a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction Compare product (sense 4)
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
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Word Origin and History for reactant

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

Online Etymology Dictionary, © 2010 Douglas Harper
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reactant in Medicine

reactant re·ac·tant (rē-āk'tənt)
n.
A substance participating in a chemical reaction, especially a directly reacting substance present at the start of the reaction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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reactant in Science
reactant
  (rē-āk'tənt)   
A substance participating in a chemical reaction, especially one present at the start of the reaction.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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