reagent

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reagent

a substance for use in a chemical reaction, esp for use in chemical synthesis and analysis

reagent

[rē′ā·jənt]
(analytical chemistry)
A substance, chemical, or solution used in the laboratory to detect, measure, or otherwise examine other substances, chemicals, or solutions; grades include ACS (American Chemical Society standards), reagent (for analytical reagents), CP (chemically pure), USP (U.S. Pharmacopeia standards), NF (National Formulary standards), and purified, technical (for industrial use).
(chemistry)
The compound that supplies the molecule, ion, or free radical which is arbitrarily considered as the attacking species in a chemical reaction.