1. A river rising in central North Dakota and flowing about 1,140 km (710 mi) generally south across South Dakota to the Missouri River.
2. A river, about 540 km (335 mi) long, rising in central Virginia and flowing eastward to Chesapeake Bay. The river is navigable to Richmond for large craft.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.