ap·o·lip·o·pro·tein 
(ăp′ə-lĭp′ō-prōtēn′, -tē-ĭn, -lī′pō-)
(ăp′ə-lĭp′ō-prōtēn′, -tē-ĭn, -lī′pō-)n.
Any of various proteins that bind to insoluble lipids to form the soluble lipoproteins, such as HDL and LDL, that transport triglycerides and cholesterol within the body.