Definitions for naphtheneˈnæf θin, ˈnæp-
Random House Webster's College Dictionary
naph•theneˈnæf θin, ˈnæp-(n.)
any of a group of hydrocarbon ring compounds of the general formula CnH2n, found in certain petroleums.
Origin of naphthene:
naph•the′nic-ˈθi nɪk, -ˈθɛn ɪk(adj.)
Any cycloalkane (or alkyl derivative).
a peculiar hydrocarbon occuring as an ingredient of Caucasian petroleum