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octane

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(äk′tān′)

noun

an oily alkane, CH, occurring in petroleum, or any of a group of isomers of this substance

Origin: oct- + -ane

See octane in American Heritage Dictionary 4

noun

Any of various isomeric paraffin hydrocarbons with the formula C₈H₁₈, found in petroleum and used as a fuel and solvent.
An octane number.

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