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: seven in a sentencecoin definitionscience meaningdefinition of savemission meaningcurious meaningfaulty definitionform meaningcustom meaningknew meaningdefinition of vagueenter definition 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