[myool] 
| 1. | the sterile offspring of a female horse and a male donkey, valued as a work animal, having strong muscles, a body shaped like a horse, and donkeylike long ears, small feet, and sure-footedness. Compare hinny 1 . |
| 2. | any hybrid between the donkey and the horse. |
| 3. | Informal. a very stubborn person. |
| 4. | Botany. any sterile hybrid. |
| 5. | Slang. a person paid to carry or transport contraband, esp. drugs, for a smuggler. |
| 6. | a small locomotive used for pulling rail cars, as in a coal yard or on an industrial site, or for towing, as of ships through canal locks. |
| 7. | Also called spinning mule. a machine for spinning cotton or other fibers into yarn and winding the yarn on spindles. |
| 8. | Nautical. a large triangular staysail set between two masts and having its clew set well aft. |
| 9. | Numismatics. a hybrid coin having the obverse of one issue and the reverse of the succeeding issue, or vice versa. |
| 10. | Biology. a hybrid, esp. one between the canary and some other finch. |
| mule 1 (myōōl) n.
[Middle English, from Old French mul and from Old English mūl, both from Latin mūlus.] |
| spinning mule n. See mule1. |
mule
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