1. a person or thing that inhibits.
  2. Chemistry. a substance that decreases the rate of or stops completely a chemical reaction.
  3. any impurity in a mineral that prevents luminescence.Compare activator(def 3).
  4. Rocketry. an inert antioxidant used with solid propellants to inhibit burning on certain surfaces.


  1. Also called: inhibiter a person or thing that inhibits
  2. Also called: anticatalyst a substance that retards or stops a chemical reactionCompare catalyst
  3. biochem
    1. a substance that inhibits the action of an enzyme
    2. a substance that inhibits a metabolic or physiological processa plant growth inhibitor
  4. any impurity in a solid that prevents luminescence
  5. an inert substance added to some rocket fuels to inhibit ignition on certain surfaces

1868 in scientific use (earlier as a Scottish legal term), agent noun in Latin form from inhibit.


  1. A substance that restrains or retards physiological, chemical, or enzymatic action.
  2. A nerve whose stimulation represses activity.
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