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Definition of: reagent
(rē·ā′jənt) noun
1. One who or that which reacts; a source of reflex action.
2. Chem. Any substance used to ascertain the nature or composition of another by means of their mutual chemical action.
3. Psychol. The subject of an experiment; particularly, one who or that which reacts to a stimulus. [<RE- + AGENT]
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