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[meth-uh-leen] /ˈmɛθ əˌlin/

adjective, Chemistry.
containing the .
(modifier) of, consisting of, or containing the divalent group of atoms =CH2: a methylene group or radical

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.

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.
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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