Naphthene :: Naphthene (n.) A peculiar hydrocarbon occuring as an ingredient of Caucasian petroleum.

Octonaphthene :: Octonaphthene (n.) A colorless liquid hydrocarbon of the octylene series, occurring in Caucasian petroleum..

Thionaphthene :: Thionaphthene (n.) A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives..

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