noun

reagent

reagent

The chemist added a reagent to the solution.

The chemist added a reagent to the solution.

This experiment requires a specific reagent.

This experiment requires a specific reagent.

a reagent ((for sth.)) a substance for use in a chemical reaction This experiment requires a specific reagent.

Synonyms: reactant, chemical, catalyst

From 're-' (again, back) + 'agent' (acting). A substance that 'acts again' or causes a reaction.

Think of it as an 'agent' that causes a 'reaction'.

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