hydrataseBiochem.|ˈhaɪdrəteɪz, -eɪs| [f. hydrate v. + -ase.] = hydrase. 1922Chem.Abstr. XVI. 936 The enzymes can be divided into hydratases, hydrolases and oxido-reductases.1953Adv.Enzymol. XIV. 237 Hence the enzyme hitherto called ‘fumarase’ should be renamed fumaric hydratase.