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Old Church Slavonic ꙗдъ (cognate)
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Proto-Germanic *aitǭ (derived)
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Old High German eiz (cognate)
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Ancient Greek οἰδέω (cognate)
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Proto-Indo-European *h₁eid- (derived)
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Old Norse eitill (inherited)
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Sanskrit इन्दु (cognate)
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Saterland Frisian eitel (cognate)
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Old Armenian այտ (mention)