catalyst
Pronunciation
Noun
B1 Intermediate
Quick answer
A substance that speeds up a chemical reaction without being changed itself, or a person or event that causes a significant change to happen.
Synonyms and antonyms
Synonyms
trigger
spark
Usage notes
In chemistry, a catalyst speeds up a reaction but is not consumed by it, a precise sense behind its more general, figurative use.
Test yourself
Which word fits the gap? "The scandal acted as a _____ for major reforms within the company."
Answer: catalyst
In your own words, what does "catalyst" mean?
A substance that speeds up a chemical reaction without being changed itself, or a person or event that causes a significant change to happen.
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