methylene

[meth-uh-leen]
adjective Chemistry.
containing the methylene group.

Origin:
< 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

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World English Dictionary
methylene (ˈmɛθɪˌliːn)
 
n
(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]

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American Heritage
Medical Dictionary

methylene meth·yl·ene (měth'ə-lēn')
n.
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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Science Dictionary
methylene   (měth'ə-lēn')  Pronunciation Key 
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.
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