Altfranzösisches etymologisches Wörterbuch
The “Dictionnaire étymologique de l’ancien français” (DEAF) is a fundamental dictionary of Old French, encompassing the timespan between 842 (date of the Strasbourg Oath between Louis the German and Charles the Bald against Lothair I transmitted in the Old High German and Old French languages) until the mid-14th century (the epochal boundary with Middle French on philological and social grounds).
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