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Dictionary  naph•thenePronunciation: (naf'thēn, nap'-), [key] —n. Chem. any of a group of hydrocarbon ring compounds of the general formula, CnH2n, derivatives of cyclopentane and cyclohexane, found in certain petroleums. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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