reactant

[ree-ak-tuhnt]
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:
1925–30; react + -ant

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Collins
World English Dictionary
reactant (rɪˈæktənt)
 
n
Compare product a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
reactant   (rē-āk'tənt)  Pronunciation Key 
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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Example sentences
Acute-phase reactants and the concept of inflammation.
In a molecular equation all reactants are written as molecules.
The binding pocket for the pair of reactants was too open and activity was low.
In any chemical reaction, there are always some reactants left, in a state called equilibrium.
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