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[meth-uh-leen] /ˈmɛθ əˌlin/
adjective, Chemistry.
containing the methylene group.
Origin of methylene
< French méthylène (coined in 1834), equivalent to Greek méth(y) wine (see mead1) + hýl(ē) wood + French -ène -ene, taken to mean “wood-spirits” (vin ou liqueur spiritueuse du bois), though elements of the compound are in the wrong order to give this sense Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for methylene
Historical Examples
  • Ehrlich has used a double stain with neutral red and methylene blue.

    Histology of the Blood Paul Ehrlich
  • Bichloride of methylene has been used for ansthetic purposes.

    Memoranda on Poisons Thomas Hawkes Tanner
  • In 48 hours bacteria appear and methylene blue is also reduced.

    The Nature of Animal Light E. Newton Harvey
  • methylene blue can be reduced by the H2 and the hypophosphite oxidized.

    The Nature of Animal Light E. Newton Harvey
  • As methylene blue contains no oxygen, its reduction consists in the addition of two atoms of hydrogen.

    The Nature of Animal Light E. Newton Harvey
  • This reduction is brought about under conditions similar to those necessary for the reduction of dyes, such as methylene blue.

    The Nature of Animal Light E. Newton Harvey
  • In the case of methylene blue, reduction consists in the addition of two hydrogen atoms.

    The Nature of Animal Light E. Newton Harvey
  • If hydrogen sulphide is passed through a solution of methylene blue the dye is very quickly reduced and becomes colorless.

    The Nature of Animal Light E. Newton Harvey
  • To this purpose a cold bath is prepared with only so much methyl violet or methylene blue, as to give the water a very faint tint.

  • Chloride of methylene is a colourless mobile fluid, having a smell like chloroform, and a burning taste.

British Dictionary definitions for methylene


(modifier) of, consisting of, or containing the divalent group of atoms =CH2: a methylene group or radical
Word Origin
C19: from French méthylène, from Greek methu wine + hulē wood + -ene: originally referring to a substance distilled from wood
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
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Word Origin and History for methylene

1835, from French méthylène (1834), coined by Jean-Baptiste-André Dumas (1800-1884) and Eugène-Melchior Péligot (1811-1890) from Greek methy "wine" (see mead (n.1)) + -yl "stuff" + chemical suffix -ene. So called because detected in wood alcohol.

Online Etymology Dictionary, © 2010 Douglas Harper
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methylene in Medicine

methylene meth·yl·ene (měth'ə-lēn')
A bivalent hydrocarbon radical, CH2, that is a component of unsaturated hydrocarbons and is derived from methane by the removal of two hydrogen atoms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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methylene in Science
A bivalent hydrocarbon radical, CH2. Because it has two unshared electrons, it is extremely reactive and occurs only as an intermediate byproduct in chemical reactions. Methylene is a component of unsaturated hydrocarbons.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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