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catalyst

 
Noun catalyst has 2 senses
  1. catalyst, accelerator - (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    --1 is a kind of activator
    Antonyms: anticatalyst
    --1 has particulars: biocatalyst; enzyme; platinum black
    Derived form: verb catalyze1
  2. catalyst - something that causes an important event to happen; "the invasion acted as a catalyst to unite the country"
    --2 is a kind of
    causal agent, cause, causal agency
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