1
- the offspring of a donkey and a horse (strictly, a male donkey and a female horse), typically sterile and used as a beast of burden骡, 马骡。比较HINNY1.
1.1
- a person compared to a mule, especially in being stupid or obstinate笨蛋; 顽固的人。
1.2
- informal a courier for illegal drugs〈非正式〉毒品送货人。
1.3
- a small tractor or locomotive, typically one that is electrically powered（尤指电动的）小型拖拉机; 小型电动机车。
2
- a hybrid plant or animal, especially a sterile one（尤指不育的）杂交动物; 杂交植物。
2.1
- any of several standard cross-bred varieties of sheep杂种羊。
3
- （亦作spinning mule）a kind of spinning machine producing yarn on spindles, invented by Samuel Crompton in 1779（1779年由塞缪尔·克朗普顿发明的）走锭纺纱机。
4
- a coin with the obverse and reverse of designs not originally intended to be used together（正、反两面的图案不相配的）错铸硬币。
词源
Old English mūl, probably of Germanic origin, from Latin mulus, mula; reinforced in Middle English by Old French mule.