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steroid hormone n.
any of a group of hormones that belong to the class of chemical compounds known as steroids; they are secreted by three "steroid glands"-the adrenal cortex, testes, and ovaries-and during pregnancy by the placenta. All steroid hormones are derived from cholesterol. They are transported through the bloodstream to the cells of various target organs where they carry out the regulation of a wide range of physiological functions