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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WORD OF THE DAY

occurring twice a year or every two years

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