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Webster 1913 Edition


Methylene

Meth′yl-ene

,
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
.

Definition 2024


methylene

methylene

See also: méthylène

English

Noun

methylene (countable and uncountable, plural methylenes)

  1. (organic chemistry) The divalent radical CH2< in which the free valencies are part of single bonds.
  2. (organic chemistry) The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.
  3. (organic chemistry) The unstable carbene CH2:

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