Noun
norethisterone (uncountable)
(pharmacology) A synthetic steroid hormone, 19-nor-17α-ethynyltestosterone (C20H26O2), which has actions similar to those of progesterone and is used chiefly for contraception.
Australia The first oral contraceptive introduced outside the United States was Schering 's Anovlar ( norethisterone acetate 4 mg + ethinyl estradiol 50 µg) on January 1, 1961 in Australia. Source: Internet
First-generation progestins include noretynodrel, norethisterone, norethisterone acetate, and etynodiol diacetate… These compounds have the lowest potency and relatively short half-lives. Source: Internet
Frank B. Colton at Searle in Skokie, Illinois had synthesized the orally highly active progestins noretynodrel (an isomer of norethisterone) in 1952 and norethandrolone in 1953. Source: Internet