/ Dictionary / Index F firethorn: Meaning and Definition of Find definitions for: fire•thorn Pronunciation: (fīr'thôrn"), [key] — n. any of several evergreen, thorny Asian shrubs belonging to the genus Pyracantha, of the rose family, many species of which are cultivated for their foliage and ornamental fruits. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: firethorn (Thesaurus) fire temple fire tower Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language