• (n.) A peculiar hydrocarbon occuring as an ingredient of Caucasian petroleum. • (n.) A peculiar hydrocarbon occuring as an ingredient of Caucasian petroleum.
Naph'thene noun (Chemistry) A peculiar hydrocarbon occuring as an ingredient of Caucasian petroleum. 
any of a group of hydrocarbon ring compounds of the general formula, CH, derivatives of cyclopentane and cyclohexane, found in certain petroleums.