methylene

 
Pronunciation: /ˈmɛθɪliːn/

noun

[as modifier] Chemistry
  • of or denoting the divalent radical or group CH2, derived from methane by loss of two hydrogen atoms: methylene chloride

Origin:

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