reactant

noun re·ac·tant \-tənt\

chemistry : a substance that changes when it is combined with another substance in a chemical reaction

Full Definition of REACTANT

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

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circa 1920

Medical Dictionary

noun re·ac·tant \-tənt\

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

—reactant adjective

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