[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. |
[myool] | 1. | a lounging slipper that covers the toes and instep or only the instep. |
| 2. | a woman's shoe resembling this. |
| mule 1 (myōōl) n.
[Middle English, from Old French mul and from Old English mūl, both from Latin mūlus.] |
| mule 2 (myōōl) n. A slipper or shoe that has no counter or strap to fit around the heel. [Probably French, slipper, possibly from Middle Dutch muil, ultimately from Latin mulleus (calceus), reddish-purple (ceremonial shoe).] |
mule
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"The mule combines the strength of the horse with the endurance and surefootedness of the ass, and is extensively bred for certain employments for which it is more suited than either; it is ordinarily incapable of procreation. With no good grounds, the mule is a proverbial type of obstinacy." [OED]Properly, the offspring of a he-ass and a mare; that of a she-ass and a stallion is technically a hinny. Used allusively of hybrids and things of mixed nature. As a type of spinning machine, attested from 1797. Meaning "stubborn person" is from 1848; that of "narcotics smuggler or courier" first attested 1935. O.Fr. mul was replaced in Fr. by dim. form mulet, hence muleteer "mule driver" (1538), from Fr. muletier.