Methylene
Methylene , noun
[French méthylène, from Greek {not transcribed} wine + {not transcribed} wood; -- a word coined to correspond to the name wood spirit.]
(Chemistry) 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.
Collocations (1)
Methylene blue (Chemistry) , an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.