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isooctane

[ahy-soh-ok-teyn]
noun Chemistry.
  1. the octane C8H18, used as one of the standards in establishing the octane number of a fuel.
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Compare octane number.

Origin of isooctane

First recorded in 1905–10; iso- + octane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for isooctane

isooctane

noun
  1. a colourless liquid alkane hydrocarbon produced from petroleum and used in standardizing petrol. Formula: (CH 3) 3 CCH 2 CH(CH 3) 2See also octane number
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012