1. An adult male horse that has not been castrated, especially one kept for breeding, or an adult male of another equine species.
2. Slang A man regarded as virile and sexually active.
[Middle English stalione (alteration of staloun), from Anglo-Norman estaloun, of Germanic origin; see stel- in the Appendix of Indo-European roots.]
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.