From Middle English squirel, squyrelle, from Anglo-Norman esquirel and Old French escurel (whence French écureuil), from Vulgar Latin *scūriolus, diminutive of *scūrius, variant of Latin sciūrus, from Ancient Greek σκίουρος "shadow-tail", from σκιά + οὐρά.
Displaced native Middle English acquerne, aquerne, from Old English ācweorna.
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