From Middle English mule, from Anglo-Norman mule and Old English mūl, both from Latin mūlus, from Proto-Indo-European *mukslós. Compare Late Latin muscellus ("young he-mule"), Old East Slavic мъшкъ ("mule"), Ancient Greek (Phocian) μυχλός, and German Maul Maultier, Maulesel (through Latin).
From Middle French mule ("slipper"), from Latin mulleus calceus, from mullus.
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