reactant

[ ree-ak-tuhnt ]

noun

1. a person or thing that reacts.
2. Also called interactant. Chemistry. any substance that undergoes a chemical change in a given reaction.

reactant

/ rɪˈæktənt /

noun

1. a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction Compare product

reactant

/ rē-ăk′tənt /

1. A substance participating in a chemical reaction, especially one present at the start of the reaction.

Word History and Origins

Origin of reactant¹

First recorded in 1925–30; react + -ant

Related Words

• impetus
• incentive
• motivation
• stimulant