/ Dictionary / Index P pocosin: Meaning and Definition of Find definitions for: po•co•sin Pronunciation: (pu-kō'sun, pō'ku-sun), [key] — n. Southeastern U.S. a swamp or marsh in an upland coastal region. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Poços de Caldas pocul. Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language