"catalyses" in the noun sense
1. catalysis, contact action
acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction
"of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
"catalyses" in the verb sense
1. catalyze, catalyse
change by catalysis or cause to catalyze
Source: WordNet® (An amazing lexical database of English)
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