/ Dictionary / Index F fireworm: Meaning and Definition of Find definitions for: fire•worm Pronunciation: (fīr'wûrm"), [key] — n. the larva of any of several moths, as Rhopobota naevanawhich feeds on the leaves of cranberries and causes them to wither. glowworm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. firework firing Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language