Definition of ethinyl estradiol
: a very potent synthetic estrogen C20H24O2 used especially as an oral contraceptive
First Known Use of ethinyl estradiol
Medical Definition of ethinyl estradiol
: a white crystalline very potent synthetic estrogen C20H24O2 prepared from estrone and used in combination (as with norgestrel or norethindrone) as a birth control pill or alone in the treatment of menopausal symptoms or female hypogonadism or in the palliative treatment of prostate or breast cancer—see ortho evra, ortho-novum, ortho tri-cyclen
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