isooctane
noun
iso·oc·tane
ˌī-sō-ˈäk-ˌtān 
: an octane of branched-chain structure or a mixture of such octanes
especially
: a flammable liquid octane used in determining the octane number of fuels
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“Isooctane.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isooctane. Accessed 21 Dec. 2024.
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