An enzyme acts as a catalyst for other chemical reactions without altering its own chemical structure.
With its chemistry connotation, catalyst entered the English language very recently, at the beginning of the 20th century. It was created from the word catalysis, a phrase used in chemistry to describe a change in a chemical reaction's course, particularly an increase in its rate brought on by a substance that is chemically unaltered at the conclusion of the reaction. By the 1940s, the word "catalyst" was used figuratively to refer to someone or anything that quickly brings about change or activity.
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