Definition of mule noun from the Oxford Advanced American Dictionary

     

    mule

     noun
    noun
    NAmE//myul//
     
     
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  1. 1an animal that has a horse and a donkey as parents, used especially for carrying loads He's as stubborn as a mule.
  2. 2(slang) a person who is paid to take drugs illegally from one country to another The authorities believe these men are important figures in the drug trade, not merely mules.
  3. 3a slipper (= a soft shoe for wearing indoors) that is open around the heel
See the Oxford Advanced Learner's Dictionary entry: mule