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A bivalent hydrocarbon group, CH2, a component of unsaturated hydrocarbons.
[French méthylène : Greek methu, wine; see medhu- in Indo-European roots + Greek hūlē, wood, substance.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) (modifier) of, consisting of, or containing the divalent group of atoms =CH2: a methylene group or radical.
[C19: from French méthylène, from Greek methu wine + hulē wood + -ene: originally referring to a substance distilled from wood]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the bivalent organic group CH2, derived from methane.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||methylene - the bivalent radical CH2 derived from methane|
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