Methylene

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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) 2.0 [wn]:

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