Dictionary

methylene

noun meth·y·lene \ˈme-thə-ˌlēn, -lən\

Definition of METHYLENE

:  a divalent hydrocarbon group CH2 derived from methane

Origin of METHYLENE

French méthylène, from Greek methy wine + hylē wood — more at mead
First Known Use: 1835

methylene

noun meth·y·lene \ˈmeth-ə-ˌlēn, -lən\   (Medical Dictionary)

Medical Definition of METHYLENE

:  a bivalent hydrocarbon radical CH2 derived from methane by removal of two hydrogen atoms

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