/ Dictionary / Index N naphthene: Meaning and Definition of Find definitions for: naph•thene Pronunciation: (naf'thēn, nap'-), [key] — n. Chem. any of a group of hydrocarbon ring compounds of the general formula, CH, derivatives of cyclopentane and cyclohexane, found in certain petroleums. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. naphthalize naphthol Related Content Daily Word Quiz: banshee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language