\ˌap-ə-ˌlī-pō-ˈprō-ˌtēn, -ˌlip-ō-, -ˈprōt-ē-ən\
: any of the proteins that combine with a lipid to form a lipoprotein and that are now grouped into four classes designated A, B, Celsius, and E and formerly into a fifth class D now considered part of A—often followed by the letter designating the class or by the letter and a number expressed in Roman or Arabic numerals to indicate a specific member of the class <apolipoprotein B is a major component of LDL>
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