/ Dictionary / Index P posticum: Meaning and Definition of Find definitions for: pos•ti•cum Pronunciation: (po-stī'kum), [key] — pl. -ca epinaos. opisthodomos (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. posticous postilion Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language