A complex chemical present in all animal fats and widespread in the body, esp. in bile, the brain, blood, adrenal glands, and nerve-fiber sheaths. It also forms deposits in blood vessels and forms gallstones.
A dominantly inherited condition that results in elevated LDL (low-density lipoprotein) cholesterol levels beginning at birth, and resultant myocardial infarctions (heart attacks) at an early age.