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Definition of octane : Any one of a group of metametric hydrocarcons ( C8H18) of the methane series. The most important is a colorless, volatile, inflammable liquid, found in petroleum, and a constituent of benzene or ligroin.

Synonyms:

colorant, dynamite, agar, gelignite, dry ice, antioxidant, antifreeze, formalin, defoliant, ether