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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
After the reactant gases react and deposit on the substrate, the exhaust gases flow toward and out the molybdenum exhaust ring.
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