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A group name for lipids that contain a hydrogenated cyclopentanoperhydrophenanthrene ring system. Some of the substances included in this group are progesterone, adrenocortical hormones, the gonadal hormones, cardiac aglycones, bile acids, sterols (such as cholesterol), toad poisons, saponins and some of the carcinogenic hydrocarbons. Any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects.Any hormone affecting the development and growth of sex organs.An important type of [[lipid.