MULE

I. noun Etymology: Middle English, from Anglo-French mul, from Latin mulus Date: 13th century 1. a hybrid between a horse and a donkey, a self-sterile plant whether hybrid or not, a usually sterile hybrid, a very stubborn person, a machine for simultaneously drawing and twisting fiber into yarn or thread and winding it into cops, a person who smuggles or delivers illicit substances (as drugs), II. noun Etymology: Middle French, a kind of slipper, from Latin mulleus shoe worn by magistrates Date: 1562 a shoe or slipper without quarter or heel strap