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Pronunciation: (ok'tān), [key]
n. Chem.
1. any of 18 isomeric saturated hydrocarbons having the formula C8H18, some of which are obtained in the distillation and cracking of petroleum.
2. See octane number.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

octanoctane number
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