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2 definitions found
 for Methylene
From The Collaborative International Dictionary of English v.0.48 :

  Methylene \Meth"yl*ene\, n. [F. m['e]thyl[`e]ne, from Gr. ? wine
     + ? wood; -- a word coined to correspond to the name wood
     spirit.] (Chem.)
     A divalent hydrocarbon radical, -CH2-, not known in the
     free state, but regarded as an essential residue and
     component of certain derivatives of methane; as, methylene
     bromide, CH2Br2; -- formerly called also methene.
     [1913 Webster]
     Methylene blue (Chem.), an artificial dyestuff consisting
        of a complex sulphur derivative of diphenyl amine; --
        called also pure blue.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: the bivalent radical CH2 derived from methane [syn:
           methylene group, methylene radical, methylene]

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