Definify.com

Webster 1913 Edition

Noun.

[F.

méthylène

, from Gr. [GREEK] wine + [GREEK] 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

See also: methylene

méthylène m ‎(uncountable)