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Butyl

[byoo-til, byoot-l]
Trademark.
a brand of synthetic rubber prepared by polymerization of butylene containing little butadiene, particularly useful for inner tubes of automobile tires because of its leakproof qualities.
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Collins
World English Dictionary
butyl (ˈbjuːˌtaɪl, -tɪl)
 
n
(modifier) of, consisting of, or containing any of four isomeric forms of the group C4H9--: butyl rubber
 
[C19: from but(yric acid) + -yl]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

butyl bu·tyl (byōōt'l)
n.
A hydrocarbon radical, C4H9.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
butyl   (byt'l)  Pronunciation Key 
The radical C4H9, derived from butane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for butyl
The first major application of butyl rubber was tire inner tubes.
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