An agent or substance that causes catalysis; a catalyst (used primarily in technical or formal chemistry contexts).
From 'catalyze' plus the agent suffix '-ator,' meaning 'one that does.' This is a more technical or formal variant of 'catalyst,' with Latin-style suffix formation.
This word is rarely used because scientists prefer the simpler 'catalyst'—but it shows how English loves to create alternatives with different suffixes from the same root!
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