Dictionary![]() ![]() i•so•bu•tyl•enePronunciation: (ī"su-byOOt'l-ēn"), [key] —n. Chem. a colorless, very volatile liquid or flammable gas, C4H8, used chiefly in the manufacture of butyl rubber. Also,i•so•bu•tenePronunciation: (ī"su-byOO'tēn). [key] Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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