norethindrone

/N AO1 R TH IH0 N D R OW1 N/
noun
  1. 1

    (pharmacology) US form of norethisterone. [(pharmacology) A synthetic steroid hormone, 19-nor-17α-ethynyltestosterone (C₂₀H₂₆O₂), which has actions similar to those of progesterone and is used chiefly for contraception.]

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