catalyst What is the Definition of catalyst?Noun:(chemistry)something that causes an important event to happen Other meanings of catalyst (synonyms, cognates). ENRU catalyst катализатор Frequently viewed: middle in a sentencecaught meaningroad meaningwhile meaningtolerate definitiontag meaningbeautiful meaningdefinition of waitpercentile definitionmode definitionrely in a sentenceadditionally in a sentence A B C D E F G H I J K L M N O P Q R S T U V W X Y Z