an alkane, CH, existing in several isomeric forms: the normal isomer is used in standard mixtures to test octane ratings
Origin:
hept(a)- + -ane
See heptane in American Heritage Dictionary 4
noun
A volatile, colorless, highly flammable liquid hydrocarbon, C7H16, obtained in the fractional distillation of petroleum and used as a standard in determining octane ratings, as an anesthetic, and as a solvent.