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WORDNET DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun reactant has 1 sense
- reactant(n = noun.substance) - a chemical substance that is present at the start of a chemical reaction; is a kind of chemical, chemical substance
Derived form verb react3
OXFORD DICTIONARY
reactant, n. Chem. a substance that takes part in, and undergoes change during a reaction.