don·key (dŏngkē, dông-)
n. pl. don·keys
1. The domesticated ass (Equus asinus), having long ears and a loud bray.
2. Slang An obstinate person.
3. Slang A stupid person.
[Perhaps from the name Duncan or of imitative origin.]
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.