Butene

noun

1. Any of three gaseous isomeric ethylene hydrocarbons, C4H8, used principally in making synthetic rubbers.
2. The official name of the hydrocarbon C4H8. It exists in three isomeric forms. Also called butylene.
3. any of three isomeric singly unsaturated hydrocarbons C4H8; all are used in making synthetic rubbers; -- called also butylene.
4. Any of several forms of butylene.
5. any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers