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ethinyl estradiol

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eth·i·nyl estradiol   (ěth'ə-nĭl')   
n.  A synthetic estrogen derivative commonly used in oral contraceptive preparations.

[ethinyl, variant of ethynyl, containing an acetylene group : ethyn(e) + -yl.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: ethinyl estradiol
Variants: or ethy·nyl·es·tra·di·ol /"eth-&-nil-"es-tr&-'dI-"ol, -"Ol/ or chieflyBritish ethi·nyl·oes·tra·di·ol or ethy·nyl·oes·tra·di·ol /"eth-&-nil-"E-str&-'dI-"ol,-E-'strad-E-"ol, -"Ol/
Function: noun
: a white crystalline very potent synthetic estrogen C20H24O2 prepared from estrone and used incombination (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 breastcancer —see ORTHO-NOVUM
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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