Webster's English Dictionary

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mule

1. mule \'myu:(*)l\ n [ME, fr. OF mul, fr. L mulus] 1a: a hybrid between a 
   horse and an ass; esp : the offspring of a m ale ass and a mare 1b: a 
   self-sterile plant whether hybrid or not  1c: a usu. sterile hybrid  2: a 
   very stubborn person  3: a machine for simultaneously drawing and twisting 
   fiber into yarn or thr ead and winding it into cops
2. mule n [MF, a kind of slipper, fr. L mulleus shoe worn by magistrates] : 
   a slipper without quarter and usu. without counter