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.
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- noun chemistry any
isomerof n- octane; especially 2,2,4-trimethylpentane, used as a referencein the determinationof the octane numberof fuel
from Wiktionary, Creative Commons Attribution/Share-Alike License
iso- + octane
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