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n. A progestational hormone, C20H26O2, similar in effect to progesterone, used especially in oral contraceptives.

n. a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis

"(Chemically, norethindrone is 17a-ethinyl-19-nortestosterone; its generic name in Europe is norethisterone)."

progestogen    progestin