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a combining form occurring in the names of chemical compounds in which the methyl group is present: methylamine.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
methyl (ˈmiːθaɪl, ˈmɛθɪl)
1.  (modifier) of, consisting of, or containing the monovalent group of atoms CH3
2.  an organometallic compound in which methyl groups are bound directly to a metal atom
[C19: from French méthyle, back formation from methylene]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"univalent hydrocarbon radical," 1844, from Ger. methyl (1840) or Fr. méthyle, back-formation from Fr. méthylène, coined in Fr. 1835 from Gk. methy "wine" + hyle "wood." The word was introduced by Swed. chemist Jöns Jakob Berzelius (1779-1848).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

methyl meth·yl (měth'əl)
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.
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American Heritage
Science Dictionary
methyl   (měth'əl)  Pronunciation Key 
The radical CH3, derived from methane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Methyl bromide then reacts with water to form methanol.
Industries use dimethyl sulfate to tack methyl groups onto organic chemicals.
Methyl mercaptan may irritate the eyes and mucous membranes.
However, exposure to methyl parathion may occur at farms where it has been used
  as a pesticide.
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