a white, crystalline sterol, CHOH, found esp. in animal fats, blood, nerve tissue, and bile: a precursor of steroid hormonesand, if present in the blood in excessive amounts, a factor in atherosclerosis
See cholesterol in American Heritage Dictionary 4
(kə-lĕsˈtə-rôlˌ, -rōlˌ)
noun
A white crystalline substance, C27H45OH, found in animal tissues and various foods, that is normally synthesized by the liver and is important as a constituent of cell membranes and a precursor to steroid hormones. Its level in the bloodstream can influence the pathogenesis of certain conditions, such as the development of atherosclerotic plaque and coronary artery disease.