LDL cholesterol

Low-density lipoprotein (LDL) belongs to the lipoprotein particle family. Its size is approx. 22 nm but since LDL particles contain a changing number of fatty acids they actually have a mass and size distribution. Each native LDL particle contains a single apolipoprotein B-100 molecule (Apo B-100, a protein with 4536 amino acid residues) that circles the fatty acids keeping them soluble in the aqueous environment..
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LDL cholesterol n. See low-density lipoprotein. LDL Cholesterol Low-density lipoprotein cholesterol is the primary cholesterol molecule. [more]LDL cholesterol - Community and Resources

Noun
1. the cholesterol in low-density lipoproteins; the `bad' cholesterol; a high level in the blood is thought to be related to various pathogenic conditions
(hypernym) cholesterol, cholesterin
(hyponym) oxidized LDL cholesterol
(substance-holonym) low-density lipoprotein, LDL, beta-lipoprotein

Low-density lipoprotein cholesterol (the "bad" cholesterol).

stands for low-density lipoprotein (LIP-oh-PRO-teen) cholesterol: a fat found in the blood that takes cholesterol around the body to where it is needed for cell repair and also deposits it on the inside of artery walls. Sometimes called "bad" cholesterol.