/ Dictionary / Index N naphtha: Meaning and Definition of Find definitions for: naph•tha Pronunciation: (naf'thu, nap'-), [key] — n. a colorless, volatile petroleum distillate, usually an intermediate product between gasoline and benzine, used as a solvent, fuel, etc. Cf. any of various similar liquids distilled from other products. petroleum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: naphtha (Thesaurus) naphth- naphthacene 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