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Từ điển WordNet v3.1 - WordNet Dictionary
catalyst


noun
1. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
Syn:
accelerator
Ant:
anticatalyst
Derivationally related forms:
catalyze
Topics:
chemistry, chemical science
Hypernyms:
activator
Hyponyms:
biocatalyst, enzyme, platinum black
2. something that causes an important event to happen
- the invasion acted as a catalyst to unite the country
Hypernyms:
causal agent, cause, causal agency


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