Any of the lipid-protein complexes in which lipids are transported in the blood. Lipoprotein particles consist of a spherical hydrophobic core of triglycerides or cholesteryl esters surrounded by an amphipathic monolayer of phospholipids, cholesterol, and apolipoproteins. ... (12 Dec 1998) ... 
Carriers of fat in the blood
Lipid-protein particles that are carried through the blood stream....
An important class of serum proteins in which a lipid core with a surface coat of phospholipid monolayer is packaged with specific proteins (apolipoproteins). Classified according to density: chylomicrons, large low density particles; very low density (VLDL); low density (LDL) and high density (HDL) species. Important in lipid transport, especially cholesterol transport.
...
Lipoproteins: Complexes of lipid and protein, the way lipids travel in the blood. Cholesterol, a building block of the outer layer of cells (cell membranes), is transported through the blood in the form of water-soluble carrier molecules known as lipoproteins. The lipoprotein particle is composed of an outer shell of phospholipid, which renders the...
Protein-coated packages that carry fat and cholesterol through the bloodstream. (Read about 'Cholesterol')
substances containing lipids and proteins, comprising most fats in the blood 
The primary means by which lipids or fatty substances are transported in the blood.
transporters of fatty substances in the blood.