from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A synthetic rubber produced by copolymerization of a butylene with isoprene, nearly impermeable to air and used in tires, inner tubes, and insulation.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A synthetic rubber made by the polymerization of isobutene and isoprene

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. synthetic rubber made by polymerizing isobutylene


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