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From: DICT.TW English-Chinese Dictionary 英漢字典

 naph·thene /ˈnæfˌθin, &dɪvɪdɛ;ˈnæp-/
 環烷

From: Webster's Revised Unabridged Dictionary (1913)

 Naph·thene n. Chem. A peculiar hydrocarbon fraction occuring as an ingredient of some crude petroleums, mostly mixtures of derivatives of the five- and six-membered saturated cyclic alkanes, cyclopentane and cyclohexane, having the general formula CnH2n.
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