| NOUN | substance | reactant | a chemical substance that is present at the start of a chemical reaction |
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| Meaning | A chemical substance that is present at the start of a chemical reaction. | |
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| Broader | chemical, chemical substance | Material produced by or used in a reaction involving changes in atoms or molecules |
| Spanish | reactante, reactivo | |
| Catalan | reactant, reactiu | |
| Verbs | react | undergo a chemical reaction |
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