The Collaborative International Dictionary
Octonaphthene
Octonaphthene \Oc`to*naph"thene\, n. [Octo- + naphthene.] (Chem.) A colorless liquid hydrocarbon of the octylene series, occurring in Caucasian petroleum.
Wiktionary
octonaphthene
n. (context organic compound English) A colourless liquid hydrocarbon, 1,3 dimethylcyclohexane, occurring in petroleum.