eth·i·nyl estradiol 
(ĕthə-nĭl′)
(ĕthə-nĭl′)n.
A synthetic estrogen derivative, C20H24O2, used in oral and other contraceptive preparations and in hormone replacement therapy, usually in combination with a progestin.
[ethinyl, variant of ethynyl, containing an acetylene group : ETHYN(E) + -YL.]
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