animals that are the offspring of a donkey and a horse; or a type of slipper or shoe without a back.
From Latin 'mulus,' possibly from Semitic origins. The animal was known in ancient times and the word traveled through European languages. The shoe was named later, probably for its resemblance to the animal's form.
Mules are completely sterile—they can't reproduce—but they're actually stronger and smarter than both their parents, showing that hybrid vigor doesn't always mean you can make babies!
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