Geó-dæg

According to the Old English Dictionary:

geó-dæg

a former day, day of old:--Þú gehýrdest þætte giódagum gelomp, Bt. 18, 4; F. 66, 27. Iúdagum Rómáni gehálgedon on þissa tungla gemynde heora dagas, Angl. viii. 321, 4. Iúdagum se biscop Theophilus wrát ǽnne pistol, 322, 45. See geó in Dict., and cf. ǽr-dæg. geo-dæg