lipoproteinPronunciation: /ˈlɪpə(ʊ)ˌprəʊtiːn, ˈlʌɪ-/Definition of lipoprotein noun Biochemistry any of a group of soluble proteins that combine with and transport fat or other lipids in the blood plasma. lipoprotein in other Oxford dictionaries Definition of lipoprotein in the US English dictionary