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Webster 1913 Edition

Noun.

[From

(Chem.)

Any one of three metameric hydrocarbons,

C4H8

, of the ethylene series. They are gaseous or easily liquefiable; – called also

butene

butylene ‎(plural butylenes)

(organic chemistry) Any of three isomeric aliphatic alkenes containing four carbon atoms and one double bond; their polymers are used as synthetic rubber.

isomeric aliphatic alkene