/ Dictionary / Index P Puerto Rico Trench: Meaning and Definition of Find definitions for: Puer'to Ri'co Trench' Pronunciation: [key] a depression in the ocean floor, N of Puerto Rico: includes deepest part of Atlantic Ocean, 28,374 ft. (8648 m). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Puerto Rico puertorriqueño* Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language