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Middle English erten (derived)
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Middle English ertin (mention)
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Ancient Greek ἄρδις (cognate)
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Proto-Indo-European *h₂erdi- (derived)
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Proto-Indo-European *h₂erd- (mention)
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Icelandic erta (cognate)
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Norwegian erta (cognate)
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Old Norse erta (derived)
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Old Irish aird (cognate)