a new thing or event that profoundly changes a situation
His marriage was already very troubled, and when he met Renuka, she proved to be the catalyst that finally blew it apart.
katalysis (dissolution, a dissolving) (Greek)
My new CAT caused A LIST (lyst) of things that suddenly changed in my life. CATA (LOOK like CATION. ions which has positive charge)like mn+2 which is a cation, and cations SPEED UP THE RATE OF REACTION, that is how they BRING A CHEMICAL CHANGE IN A REACTION.