/ Dictionary / Index P Plata: Meaning and Definition of Find definitions for: Pla•ta Pronunciation: (plä'tä), [key] an estuary on the SE coast of South America between Argentina and Uruguay, formed by the Uruguay and Paraná rivers, ab. 185 mi. (290 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plat Plataea Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language