Ethinyl-estradiol definitions

ĕth'ə-nĭl'
A synthetic estrogen derivative commonly used in oral contraceptive preparations.
noun
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A synthetic estrogen derivative, C20 H24 O2 , used in oral and other contraceptive preparations and in hormone replacement therapy, usually in combination with a progestin.
noun
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Origin of ethinyl-estradiol

ethinyl variant of ethynyl containing an acetylene group ethyn(e) –yl