Etymology
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reagent (n.)

1785, originally in chemistry, "a substance used to effect chemical change in another substance to render its nature more evident," from re- + agent (n.) "substance that produces a chemical reaction."

updated on May 09, 2021

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Definitions of reagent from WordNet

reagent (n.)
a chemical agent for use in chemical reactions;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.