/ Dictionary / Index B ballistospore: Meaning and Definition of Find definitions for: bal•lis•to•spore Pronunciation: (bu-lis'tu-spôr", -spōr"), [key] — n. Mycol. a forcibly expelled mature fungal spore. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ballistocardiograph ballium Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language