1) Chemical group 2) Containing a butyl group 3) Group 4) Kind of alcohol or nitrite 5) Radical 6) Rubber used for inner tubes 7) Rubber used in inner tubes 8) Synthetic rubber 9) Type of rubber 
In organic chemistry, butyl is a four-carbon alkyl radical or substituent group with general chemical formula -C4H9, derived from either of the two isomers of butane. The isomer n-butane can connect either at one of the two terminal carbon atoms or at one of the two internal carbon atoms, giving rise to two `-butyl` groups: The second, branched .....
• (n.) A compound radical, regarded as butane, less one atom of hydrogen.
Type of non-curing and non-skinning sealant made from butylene. Usually used for internal applications. 
(bu´tәl) a hydrocarbon radical, C4H9.
Type of non-curing and non-skinning sealant made from butylene. Usually used for internal applications.
Bu'tyl noun [ Latin but yrum butter + -yl . See Butter .] (Chemistry) A compound radical, regarded as butane, less one atom of hydrogen. 
Type: Term Pronunciation: byū′til Definitions: 1. a radical of N-butane.
A synthetic rubber formed by the copolymerization of isobutylene and isoprene.
[n] - made by polymerizing isobutylene
noun a hydrocarbon radical (C4H9)
A type of rubber used for speaker surrounds. Butyl has very good damping characteristics and is resi
containing a butyl group.