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reactant
 

Definitions from WordNet

Noun reactant has 1 sense
  1. reactant - a chemical substance that is present at the start of a chemical reaction
    --1 is a kind of     chemical
    Derived form: verb react2

Definitions from the Web

Reactant

Noun: A substance that takes part in and undergoes change in a chemical reaction.

Example sentence: The reactant, hydrogen, combines with oxygen to form water in this chemical equation: 2H2 + O2 -> 2H2O.

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