Pronunciation: (byOO'til, byOOt'l), [key]
containing a butyl group.
Pronunciation: (byOO'til, byOOt'l), [key] 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.