Definition of ethinyloestradiol in English:

ethinyloestradiol

(also ethynyloestradiol, ethinylestradiol, ethynylestradiol)

noun

Pharmacology
  • A synthetic oestrogen used in oral contraceptives.

Origin

1930s; earliest use found in The British Medical Journal. From ethinyl, variant of ethynyl + oestradiol, after German Aethinyl-oestradiol.

Pronunciation

ethinyloestradiol

/ˌɛθɪnɪlˌiːstrəˈdʌɪɒl//ˌɛθɪnɪlˌɛstrəˈdʌɪɒl/