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Meaning of isooctane

i•so•oc•tane

Pronunciation: (ī"sō-ok'tān), [key]
— n. Chem.
  1. the octane CH, used as one of the standards in establishing the octane number of a fuel. Cf. octane number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.