/ Dictionary / Index N naphth-: Meaning and Definition of Find definitions for: naphth- Pronunciation: [key] a combining form representingorin compound words: naphthol. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Naphtalite naphtha 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