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octane

[ok-teyn] /ˈɒk teɪn/
noun, Chemistry
1.
any of 18 isomeric saturated hydrocarbons having the formula C 8 H 1 8 , some of which are obtained in the distillation and cracking of petroleum.
Origin of octane
1870-1875
1870-75; oct- + -ane
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for octane

octane

/ˈɒkteɪn/
noun
1.
a liquid alkane hydrocarbon found in petroleum and existing in 18 isomeric forms, esp the isomer n-octane. Formula: C8H18 See also isooctane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for octane
n.

hydrocarbon of the methane series, 1872, coined from octo- (see octa-) + -ane; so called because it has eight carbon atoms. A fuel's octane rating, in reference to its anti-knocking quality, is attested from 1932.

Online Etymology Dictionary, © 2010 Douglas Harper
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octane in Science
octane
  (ŏk'tān')   
Any of several hydrocarbons having eight carbon atoms connected by single bonds. It is commonly added to gasoline to prevent knocking from uneven burning of fuel in internal-combustion engines. Octane is the eighth member of the alkane series. Chemical formula: C8H18.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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