isooctane[ī′sō äk′tān, -sə-]
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a liquid hydrocarbon, (CH)CHCHC(CH), used with normal heptane to prepare antiknock rating standards and arbitrarily assigned an octane rating of 100
Origin: iso- plush octane
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A highly flammable liquid, (CH3)2CHCH2C(CH3)3, used to determine the octane ratings of fuels.