/ Dictionary / Index X xiphisternum: Meaning and Definition of Find definitions for: xiph•i•ster•num Pronunciation: (zif"u-stûr'num), [key] — pl. -na the lowermost of the three segments of the sternum. Cf.(def. 2),(def. 2a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Xipe xiphoid Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language