ὀγδόατος
From LSJ
κούφα σοι χθὼν ἐπάνωθε πέσοι → may earth lie lightly on thee, may the earth rest lightly on you, may the ground be light to you, may the earth be light to you
English (LSJ)
η, ον, poet. for ὄγδοος, as τρίτατος for τρίτος,
A the eighth, Il.19.246, Od.3.306, Emp. 68 ; ὀ. δεκάς Rev.Phil.22.357 ; ἡ ὀγδοάτη (sc. ἡμέρα) the eighth day, octave, Hes.Op.772, 790 (καθ' ὁγδοάδην δεκάδα prob. in Jahresh.23 Beibl.402 (Egypt)).