/ Dictionary / Index P Piedras Negras: Meaning and Definition of Find definitions for: Pie•dras Ne•gras Pronunciation: (pye'räs ne'gräs), [key] a city in N Mexico, on the Rio Grande. 65,883. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pied Piper pie-eyed Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language