MULE, noun [Latin mulus.]
1. A quadruped of a mongrel breed, usually generated between an ass and a mare, sometimes between a horse and a she-ass. But the name is applied to any animal produced by a mixture of different species.
2. A plant or vegetable produced by impregnating the pistil of one species of plant with the farin or fecundating dust of another. This is called also a hybrid.