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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


(ˈmɛθ əˌlin)

the bivalent organic group CH2, derived from methane.
[< French méthylène (1834) = Greek méth(y) wine (see mead1) + hýl(ē) wood + French -ène -ene]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.methylene - the bivalent radical CH2 derived from methane
chemical group, radical, group - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Metwally, "Adsorptive removal of methylene blue as organic pollutant by marble dust as eco-friendly sorbent," Journal of Industrial and Engineering Chemistry, vol.
Methylene blue is a standard photoacoustic dye, and it is a low-cost drug with lower toxicity that has been useful in cardiopulmonary bypass surgery and in clinical treatment of septic shock, methaemoglobinaemia, and Alzheimer's [5-8].
proposed a new estimation method to determine SWCC for unbound aggregate mixtures based on the methylene blue value (MBV) and percent fines content (PFC) [11-13].
EPA, which has associated methylene chloride with adverse health effects, has proposed a rule to prohibit methylene chloride in paint and coating removal products.
Objective: To compare the accuracy and feasibility of methylene blue and nano-carbon in clinical tracing of sentinel lymph nodes (SLNs) in patients with papillary thyroid cancer (PTC).
M2 PHARMA-October 18, 2017-FDA Accepts Aries Pharmaceuticals' NDA for Methylene Blue MMX
I know methylene blue only from my days as medical student studying the pathology of vital organs.
Four methylene blue concentrations were prepared, which are 10 mg/L, 20 mg/L, 30 mg/L, and 50 mg/L.
One such therapy for refractory vasodilatory shock is methylene blue which is a guanylyl cyclase inhibitor and inhibits production of cGMP and therefore inhibits dephosphorylation of myosin, decreasing vasodilation [1].
The use of activated carbon from the macadamia shells have been used in adsorption dyes (methylene blue) (Pezoti Junior et al., 2014), and drugs (tetracycline) (Martins et al., 2015), obtaining excellent maximum adsorption capacity, of 194 and 455 mg [g.sup.-1], respectively.
ACF are invisible during routine colonoscopy yet are well identifiable in chromoendoscopy using methylene blue or indigo carmine.
NBI Forensic Division chief of staff Rommel Papa said they found traces of methylenedioxymethamphetamine (MDMA) methylene homolog and methylenedioxycathinone commonly known as bath salts in one of the two victims that they have autopsied.