[meth-uh l]

adjective Chemistry.

containing the methyl group.

Origin of methyl

First recorded in 1835–45; by back formation from methylene
Related formsme·thyl·ic [me-thil-ik, muh-] /mɛˈθɪl ɪk, mə-/, adjective


a combining form occurring in the names of chemical compounds in which the methyl group is present: methylamine. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for methyl



(modifier) of, consisting of, or containing the monovalent group of atoms CH 3
an organometallic compound in which methyl groups are bound directly to a metal atom
Derived Formsmethylic (məˈθɪlɪk), adjective

Word Origin for methyl

C19: from French méthyle, back formation from methylene
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 methyl

univalent hydrocarbon radical, 1840, from German methyl (1840) or directly from French méthyle, back-formation from French méthylène (see methylene).

Online Etymology Dictionary, © 2010 Douglas Harper

methyl in Medicine




The alkyl group, often a univalent radical, CH3, derived from methane and occurring in many important organic compounds.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

methyl in Science



The radical CH3, derived from methane.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.