Definition of reactant in English:

reactant

noun

Chemistry
  • A substance that takes part in and undergoes change during a reaction.

    • ‘If some of the components of this system chemically react with each other then the inert substance dispersing the reactants is the inert solvent.’
    • ‘Countless industrial processes use acids and bases as reactants or catalysts to make a variety of consumer goods.’
    • ‘When bonds are broken in a chemical reaction, the reactants involved are colliding with enough kinetic energy to break the atoms apart.’
    • ‘The change in heat content of the products relative to the reactants in a chemical reaction is known as the change in enthalpy.’
    • ‘The rate of chemical reactions often depends on the concentration of the reactants involved.’

Pronunciation:

reactant

/rɪˈakt(ə)nt/