/ Dictionary / Index N naphthalene: Meaning and Definition of Find definitions for: naph•tha•lene Pronunciation: (naf'thu-lēn", nap'-), [key] — n. Chem. a white, crystalline, water-insoluble hydrocarbon, CH, usually obtained from coal tar: used in making dyes, as a moth repellant, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: naphthalene (Thesaurus) naphthacene naphthalize 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