noun Chemistry.
the octane C 8 H 18 , used as one of the standards in establishing the octane number of a fuel.
Compare octane number.

1905–10; iso- + octane Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isooctane (ˌaɪsəʊˈɒkteɪn)
See also octane number a colourless liquid alkane hydrocarbon produced from petroleum and used in standardizing petrol. Formula: (CH3)3CCH2CH(CH3)2

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To this mixture, isooctane was added to cause flocculation and asphaltene precipitation.
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