butyl Hear it!

butyl definition

bu·tyl (byo̵̅o̅t′'l)

noun

  1. any of the four monovalent organic radicals (normal butyl, secondary butyl, tertiary butyl, isobutyl) having the same formula, CH, but differing in properties and structure
  2. ☆ butyl rubber

Etymology: < L butyrum, butter + -yl

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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