high-density lipoprotein (HDL) - one of the five major groups of lipoproteins... which enable lipids like cholesterol and triglycerides to be transported within the water-based bloodstream, HDL particles are able to remove cholesterol from within artery walls (atherosclerosis) and transport it back to the liver for excretion or re-utilization, which is the main reason why the cholesterol carried within HDL particles (HDL-C) is sometimes called good cholesterol... "Those with higher levels of HDL-C seem to have fewer problems with cardiovascular diseases, while those with low HDL-C cholesterol levels (less than 40 mg/dL or about 1 mmol/L) have increased rates for heart disease" (See Wikipedia)
good cholesterol - same as "HDL"