1 noun CHEM, BIOCHEM reactioncatalaíoch masc1 c m u2 noun causecatalaíoch masc1 c m udebt was the catalyst for the crisisfiacha ba chúis leis an ngéarchéimthis experience became the catalyst for her novelba é an t-eispéireas seo a spreag a húrscéal3 noun AUTO catalytic convertertiontaire catalaíoch c m u