mule
The generally sterile male or female hybrid offspring of a male donkey and a female horse.
Other meanings
The generally sterile hybrid offspring of any two species of animals.
A coin or medal minted with obverse and reverse designs not normally seen on the same piece, either intentionally or in error.
Word history
From Latin "mūlus".
Where this comes from
This definition is adapted from “mule” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.