wa·di also wa·dy (wädē)
n. pl. wa·dis also wa·dies
a. A valley, gully, or streambed in northern Africa and southwest Asia that remains dry except during the rainy season.
b. A stream that flows through such a channel.
2. An oasis.
[Arabic wādi; see wdy in the Appendix of Semitic roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.