Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A flammable liquid hydrocarbon, C8H18, having a highly branched structure and used as a solvent and to determine the octane ratings of fuels.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry any isomer of n-octane; especially 2,2,4-trimethylpentane, used as a reference in the determination of the octane number of fuel

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

iso- +‎ octane

Examples

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