[ eth-uh l ]
/ ˈɛθ əl /


Chemistry. containing the ethyl group, as ethyl ether, C4H10O.


a type of antiknock fluid, containing tetraethyl lead and other ingredients for a more even combustion.

Nearby words

  1. ethosuximide,
  2. ethoxide,
  3. ethoxy,
  4. ethoxyethane,
  5. ethrog,
  6. ethyl acetate,
  7. ethyl alcohol,
  8. ethyl aminobenzoate,
  9. ethyl butyrate,
  10. ethyl caproate

Origin of ethyl

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

Related formsnon·eth·yl, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ethyl

British Dictionary definitions for ethyl


/ (ˈiːθaɪl, ˈɛθɪl) /


(modifier) of, consisting of, or containing the monovalent group C 2 H 5-ethyl group or radical
Derived Formsethylic (ɪˈθɪlɪk), adjective

Word Origin for ethyl

C19: from eth (er) + -yl

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ethyl


1838, modeled on German äthyl (Liebig), from Greek aither (see ether) + -yl. Ethyl alcohol, under other names, was widely used in medicine by 13c.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ethyl


[ ĕthəl ]


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.

Science definitions for ethyl


[ ĕthəl ]

The radical C2H5, derived from ethane.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.