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methylene Line breaks: methy|lene
Pronunciation: /ˈmɛθɪliːn/

Definition of methylene in English:


[as modifier] Chemistry
Of or denoting the divalent radical or group —CH2—, derived from methane by loss of two hydrogen atoms: methylene chloride
More example sentences
  • Your body changes some inhaled methylene chloride to carbon monoxide.
  • The formation of conjugated dienes occurs when free radicals attack the hydrogens of methylene groups separating double bonds and leading to a rearrangement of the bonds.
  • Paint and other materials that are not soluble in degreasing solvents may require the use of methylene chloride, alkaline cleaners, or special proprietary compounds.


Mid 19th century: from French méthylène (formed irregularly from Greek methu 'wine' + hulē 'wood') + -ene.

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