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reactant [reactants]▼(participant at the start of a chemical reaction)noun[UK: ri.ˈæk.tənt] [US: ri.ˈæk.tənt]
reagent [reagents]▼(substance used in chemical reactions)noun[UK: riː.ˈeɪ.dʒənt] [US: ri.ˈeɪ.dʒənt]
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