reactant

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Definitions from WordNet

Noun reactant has 1 sense

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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