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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