| Noun | 1. | alpha-lipoprotein - a lipoprotein that transports cholesterol in the blood; composed of a high proportion of protein and relatively little cholesterol; high levels are thought to be associated with decreased risk of coronary heart disease and atherosclerosis lipoprotein - a conjugated protein having a lipid component; the principal means for transporting lipids in the blood HDL cholesterol - the cholesterol in high-density lipoproteins; the `good' cholesterol; a high level in the blood is thought to lower the risk of coronary artery disease |