an alkane, CH, existing in several isomeric forms: the normal isomer is used in standard mixtures to test octane ratings
Origin of heptanehept(a)- + -ane
Any of several isomeric, volatile, colorless, highly flammable liquid hydrocarbons, C7H16, obtained in the fractional distillation of petroleum and used as solvents. The straight-chain isomer is also used as a standard in determining octane ratings and as an anesthetic.
hepta- + -ane