/ Dictionary / Index S South Platte: Meaning and Definition of Find definitions for: South' Platte' Pronunciation: [key] a river flowing NE from central Colorado to the Platte River in W Nebraska. 424 mi. (683 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. South Plainfield South Pole Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language