Dictionary entry

ὄγδοος

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

ὄγδοος, -η, -ον,

the eighth: Lk 1:59, Ac 7:3^(LXX), Re 17:11 21:20; one of eight, with seven others (usually, in this sense, with αὐτός added, but cf. Plat., Legg., iii, 695c; Plut., Pelop., 13; II Mac 5:27): II Pe 2:5.†