Dictionary![]() ![]() bu•tyl•enePronunciation: (byOOt'l-ēn"), [key] Chem. —n. Also,butene.any of three isomeric, gaseous hydrocarbons having the formula C4H8, of the alkene series. —adj. containing the butylene group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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