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The Collaborative International Dictionary of English v.0.48 (gcide)

butene \butene\ n.
any of three isomeric singly unsaturated hydrocarbons {C4H8};
all are used in making synthetic rubbers; -- called also
{butylene}.
[WordNet 1.5]


Butylene \Bu"ty*lene\, n. [From {Butyl}.]
1. (Chem.) Any one of three metameric hydrocarbons, {C4H8},
of the ethylene series. They are gaseous or easily
liquefiable; -- called also {butene}.
[1913 Webster]

2. the hypothetical divalent radical {-(CH2)4-}; -- used in
combining forms; as, butylene diamine.
[PJC]

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