Medical Definition of apolipoprotein
: a protein that combines with a lipid (such as cholesterol or triglyceride) to form a lipoprotein ◆Apolipoproteins are grouped into several classes designated by letters, such as A, B, or C, with specific class members typically identified by a number. <… some doctors are using a new cholesterol test that may better predict heart attacks, particularly among women. It looks at particles called apolipoprotein B (apoB), which are found in LDL cholesterol.—Ladies' Home Journal, February 2005> <HDL particles contain equal parts of protein and cholesterol; the protein component consists mainly of apolipoprotein A-1 …—C. Ezzell, Science News, 21 Sept. 1991>—called also
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