/ Dictionary / Index P posteriad: Meaning and Definition of Find definitions for: pos•te•ri•ad Pronunciation: (po-stēr'ē-ad", pō-), [key] — adv. Anat., Zool. toward the posterior; posteriorly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. poste restante posterior Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language