butylene

(byo̵̅o̅t'l ēn′)

noun

any of four alkenes, including isobutylene, having the same formula, CH, but differing in properties and structure

Origin: butyl + -ene

See butylene in American Heritage Dictionary 4

noun
Any of three gaseous isomeric ethylene hydrocarbons, C4H8, used principally in making synthetic rubbers.

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