A river of central Africa flowing about 4,700 km (2,920 mi) north, west, and southwest through the Democratic Republic of the Congo to the Atlantic Ocean. Its remotest tributaries rise in northern Zambia. For much of its latter course the river forms the border between the Democratic Republic of the Congo and the Republic of the Congo.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.