The American Heritage® Dictionary of the English Language, 4th Edition
n. An extremely flammable, colorless, mobile liquid, C6H12, obtained from petroleum and benzene and used in the manufacture of nylon and as a solvent, a paint, and a varnish remover.
n. An alicyclic hydrocarbon, C6H12, consisting of a ring of six carbon atoms; a volatile liquid.
The Century Dictionary and Cyclopedia
n. A hydrocarbon, C6H12, found in Russian and in Californian petroleum, and also prepared synthetically. It boils at 81° C.
Word Usage
"The supposed formula for "phthalates" was instead for an organic phosphate, while the formulas for PBA and PBDE showed cyclohexane rings instead of the correct benzene rings."