methylene

noun
meth·​y·​lene | \ˈme-thə-ˌlēn, -lən\

Definition of methylene 

: a divalent hydrocarbon group CH2 derived from methane

First Known Use of methylene

1835, in the meaning defined above

History and Etymology for methylene

French méthylène, from Greek methy wine + hylē wood — more at mead

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The first known use of methylene was in 1835

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methylene

noun
meth·​y·​lene | \ˈmeth-ə-ˌlēn, -lən \

Medical Definition of methylene 

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

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