ὀκταετηρίς

English (LSJ)

ίδος, ἡ,

   A cycle of eight years, used at Athens before Meton's time for bringing the lunar and solar years together, 3 months being intercalated to complete the sum of 2,922 days, Eudox.Ars 13.12, Str.7.5.5, Gem.8.27 sqq., Placit. 2.32.2.