单词	norethindrone
释义	norethindrone noun nor·​eth·​in·​drone ˌnȯr-ˈe-thən-ˌdrōn  : a synthetic progestational hormone C20H26O2 used in birth control pills often in the form of its acetate Example Sentences Recent Examples on the Web Have had a serious allergic reaction to elagolix, estradiol, norethindrone acetate, or any of the ingredients in ORIAHNN. Noel Mumford, Essence, 27 May 2021 A few months later, the team synthesized a hormone known as norethindrone, which was originally intended to help pregnant women avoid miscarriages. Steve Marble, latimes.com, 27 June 2019 Word History Etymology nor- + ethinyl + hydr- + -one (as in progesterone) First Known Use 1958, in the meaning defined above Medical Definition norethindrone noun nor·​eth·​in·​drone nȯr-ˈeth-ən-ˌdrōn, ˌnȯr-eth-ˈin-  : a synthetic progestational hormone C20H26O2 used in birth control pills often in the form of its acetate C22H28O3 see loestrin, minastrin, ortho-novum
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