reactant
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re·ac·tant

noun \-tənt\

Definition of REACTANT

: a substance that enters into and is altered in the course of a chemical reaction

First Known Use of REACTANT

circa 1920

Rhymes with REACTANT

re·ac·tant

noun \-tənt\   (Medical Dictionary)

Medical Definition of REACTANT

: a substance that enters into and is altered in the course of a chemical reaction
reactant adjective

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