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
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