hydrolyze Syllabification: (hy·dro·lyze)Pronunciation: /ˈhīdrəˌlīz/ (Britishhydrolyse)Definition of hydrolyze verb [with object] Chemistry break down (a compound) by chemical reaction with water. [no object] undergo chemical breakdown due to reaction with water. hydrolyze in other Oxford dictionaries Definition of hydrolyze in the British & World English dictionary