Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A bivalent hydrocarbon group, CH2, a component of unsaturated hydrocarbons.

from The Century Dictionary.

  • noun A bivalent hydrocarbon radical (CH2) which does not exist free, but occurs in many compounds, as methylene iodide, CH2I2. Also called methene.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) A divalent hydrocarbon radical, -CH2-, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; ; -- formerly called also methene.
  • noun (Chem.) an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun organic chemistry The divalent radical CH2< in which the free valencies are part of single bonds.
  • noun organic chemistry The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.
  • noun organic chemistry The unstable carbene CH2:

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the bivalent radical CH2 derived from methane

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French méthylène : Greek methu, wine; see medhu- in Indo-European roots + Greek hūlē, wood, substance.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

French méthylène, from Ancient Greek μέθυ (methy, "wine") + ὕλη (hylē, "wood").

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