a person or thing that reacts. Also called interactant. Chemistry. any substance that undergoes a chemical change in a given reaction.
Origin of reactant
First recorded in 1925–30; react
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for reactantimpetus
Examples from the Web for reactant
Historical Examples of reactant
No matter what distance or reactant I assume, nothing we know will fit.
"She's been stripped of her reactant pile, Major," said Strong.
What kind of reactant is Quent Miles using in that ship of yours?
"Reactant feeding at D-9 rate," said Barret after a split-second pause.
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.
British Dictionary definitions for reactant
a substance that participates in a chemical reaction, esp a substance that is present at the start of the reactionCompare product (def. 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
Word Origin and History for reactant
Online Etymology Dictionary, © 2010 Douglas Harper
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.
A substance participating in a chemical reaction, especially one present at the start of the reaction.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.