From Middle English uncle, borrowed from Anglo-Norman uncle and Old French oncle, from Vulgar Latin, from Latin avunculus ("mother’s brother"), from Proto-Indo-European, a dialectal diminutive of *h₂éwh₂os (whence also avus). Displaced native Middle English eam, eme from Old English ēam, containing the same Proto-Indo-European root, and Old English fædera. Compare Saterland Frisian Unkel ("uncle"), Dutch nonkel ("uncle"), German Low German Unkel ("uncle"), German Onkel ("uncle"), Danish onkel ("uncle"). More at eam and eame.
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