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Noun
1. reagentChemistry
Wikipedia definition
2. ReagentA reagent is a "substance or compound that is added to a system in order to bring about a chemical reaction, or added to see if a reaction occurs. " Although the terms reactant and reagent are often used interchangeably, a reactant is less specifically a "substance that is consumed in the course of a chemical reaction". Solvents and catalysts, although they are involved in the reaction, are usually not referred to as reactants.
Read “Reagent” on English Wikipedia
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Read “Reagent” on DBpedia

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