| Noun | 1. | North Platte - a river that rises in northern Colorado and flows northward into Wyoming and then eastward and southeastward through Nebraska where it joins the South Platte to form the Platte RiverEquality State, WY, Wyoming - a state in the western United States; mountainous in the west and north with the Great Plains in the east river - a large natural stream of water (larger than a creek); "the river was navigable for 50 miles" | |