/ Dictionary / Index B ballista: Meaning and Definition of Find definitions for: bal•lis•ta Pronunciation: (bu-lis'tu), [key] — pl. -tae an ancient military engine for throwing stones or other missiles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ballista (Thesaurus) ballism ballistic Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language