Isooctane definitions

ī'sō-ŏk'tān'
A flammable liquid hydrocarbon, C8 H18 , having a highly branched structure and used as a solvent and to determine the octane ratings of fuels.
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A liquid hydrocarbon, (CH3)2CHCH2C(CH3)3, occurring in petroleum and used in octane rating standards.
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(chemistry) Any isomer of n-octane; especially 2,2,4-trimethylpentane, used as a reference in the determination of the octane number of fuel.
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Origin of isooctane

iso- +‎ octane