From Middle English edre ("a vein, blood vessel"), from Old English ǣdre ("a vein, artery; sinew"), from Proto-West Germanic *ādrā.
Cognates include Old Saxon -āðara (Dutch ader), Old High German ādra (German Ader), Old Norse æðr (Swedish åder); Ancient Greek ἦτορ ("heart"), Latin uterus, Old Irish inathar ("entrails").
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