anticatalyst anticatalase • anticatalytic · · · Info · Definitions · Antonyms · Characters · · anticatalyst · · Text Latin · · Script 12 · · Length Definitions · · · (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst. · · Noun Definition 1 Antonyms · · · catalyst · · Antonym 0 accelerator · · Antonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079