■ noun a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
↘a person or thing that precipitates an event.
Origin
early 20th cent.: from catalysis , on the pattern of analyst .
■ noun a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
↘a person or thing that precipitates an event.
Origin
early 20th cent.: from catalysis , on the pattern of analyst .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004