OLD NORSE • DICTIONARY ONE.COM • Definition of Old Norse

... slaughter and desolation." There remain to this day some traces of the worship paid to Odin in the name given by almost all the people of the north to the fourth day of the week, which was formerly consecrated to him. It is called by a name which signifies "Odin's day;" "Old Norse, Odinsdagr; Swedish and Danish, Onsdag; Anglo-Saxon, Wodenesdaeg, Wodnesdaeg; Dutch, Woensdag; English, Wednesday. As Odin or Wodun was supposed to correspond to the Mercury of the Greeks and Romans, the name of this day was ...

— The Germany and the Agricola of Tacitus • Tacitus