The Collaborative International Dictionary
Lactoprotein
Lactoprotein \Lac`to*pro"te*in\, n. [L. lac, lactis, milk + E. protein.] (Physiol. Chem.) A peculiar albuminous body considered a normal constituent of milk.
Wiktionary
lactoprotein
n. (context protein English) Any protein (such as casein) present in milk