Eahtoða

According to the Old English Dictionary:

eahteða, ehteoða, ehtuða;

eahtoða

m: -ðe; f. n: adj. The eighth; octāvus :-- Eahtoðan síðe an eighth time. Exon. 80 b; Th. 303, 26; Fä. 59. eahtoða,eahtoþa