isooctane[ī′sō äk′tān, -sə-]
isooctane definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
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
isooctane definition by American Heritage Dictionary
A highly flammable liquid, (CH3)2CHCH2C(CH3)3, used to determine the octane ratings of fuels.