Definition of "catalyzer" [catalyzer]

• That which catalyzes. (noun)

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• "DEFINITION: _A catalyzer is a substance which changes the velocity of a reaction, but does not change its products."
• "Analogy: Replacing the catalyzer in an 03-K64 Firefly."
• "Also, Fillion revealed on Twitter that he swiped the catalyzer from 'Out of Gas' and put it in Castle's living room bookshelf beneath the model boat."