In biochemistry|lang=en terms the difference between hydrolysis and lactolysis

is that hydrolysis is (biochemistry) the degradation of certain biopolymers (proteins, complex sugars) by the chemical process that results in smaller polymers or monomers (such as amino acids or monosaccharides) while lactolysis is (biochemistry) the hydrolysis of lactose (typically by a (galactosidase)).

As nouns the difference between hydrolysis and lactolysis

is that hydrolysis is (chemistry) a chemical process of decomposition involving the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion of water while lactolysis is (biochemistry) the hydrolysis of lactose (typically by a (galactosidase)).