/ˈlaktik/
Adjective
1. Of or relating to or obtained from milk (especially sour milk or whey). (wordnetweb.princeton.edu)
2. Of, pertaining to, or involving the production of lactic acid, as lactic fermentation. (biology-online.org)
Word origin: From French lactique, from Latin lactis, genitive of lac “milk” + French –ique.