Definitions for lacticˈlæk tɪk Random House Webster's College
Dictionary of, pertaining to, or obtained from milk. Origin of
lactic: 1780–90; < L lact-, s. of lac milk +-ic of or relating
to or obtained from milk (especially sour milk or whey) "lactic
acid"; "lactic fermentation" Of, relating to, or derived from
milk Origin: From lactis, genitive form of lac. of or pertaining
to milk; procured from sour milk or whey; as, lactic acid;
lactic fermentation, etc