From The Collaborative International Dictionary of English v.0.44 [gcide]:
Methylene \Meth"yl*ene\, noun [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}.
{Methylene blue} (Chem.), an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also {pure blue}.
From WordNet (r) 2.0 [wn]:
noun
1: the bivalent radical CH2 derived from methane [syn: {methylene group}, {methylene radical}]
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