/ Dictionary / Index F fulgurite: Meaning and Definition of Find definitions for: ful•gu•rite Pronunciation: (ful'gyu-rīt"), [key] — n. a tubelike formation in sand or rock, caused by lightning. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fulgurating fulgurous Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language