/ Dictionary / Index P presternum: Meaning and Definition of Find definitions for: pre•ster•num Pronunciation: (prē-stûr'num), [key] — pl. -na -nums. manubrium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Prester John prestidigitation Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language