LSJὀκτωκαιδεκα-ετηρίςGlossperiod of eighteen years,ὀκτωκαιδεκα-ετηρίς,ίδος,ἡ,A. period of eighteen years,Ptol. Alm. 4.3 , al.ReferencesPtol. Alm. 4.3