Chemistry. containing the ethyl group, as ethyl ether, C 4 H 10 O.
a type of antiknock fluid, containing tetraethyl lead and other ingredients for a more even combustion.

< German Ethyl, coined by J. von Liebig in 1834; see ether, -yl

nonethyl, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ethyl (ˈiːθaɪl, ˈɛθɪl)
(modifier) of, consisting of, or containing the monovalent group C2H5-: ethyl group or radical
[C19: from eth(er) + -yl]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1838, modeled on Ger. äthyl, from Gk. aither (see ether) + hyle "stuff." Ethane first recorded 1873.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ethyl eth·yl (ěth'əl)
The univalent hydrocarbon radical C2H5.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ethyl   (ěth'əl)  Pronunciation Key 
The radical C2H5, derived from ethane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
That's what alcohol- ethyl alcohol- does in the phenomenon termed drunkenness.
High octane gasoline as well as ethyl alcohol fuel blends typically stay in the
  same price range, while alcohol has been cheaper.
Using corn or sugar cane as feedstock for ethanol plants is not the only way to
  produce ethyl alcohol.
The hydrogen is then used to convert ethyl acetate into ethanol.
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