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[ree-ak-tuh nt] /riˈæk tənt/

a person or thing that .
Also called interactant. Chemistry. any substance that undergoes a chemical change in a given .
a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction Compare product (sense 4)

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

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


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  • Reactionarism

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