01 n. A divalent hydrocarbon radical, -CH2-, not known in the free state, but regarded as an essential residue and component of certain derivativ…
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1.
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.(Chem.) Also: methene
Phrases & compounds
Methylene blue —
an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.