noun🔗ShareAny of the eighteen isomeric aliphatic hydrocarbons (C8H18) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents."The car engine requires high octane fuel to prevent knocking and improve performance. "compoundsubstancechemistryfuelChat with AIVocabulary GamePractice Reading
