διετηρίς
From LSJ
Κύριε, βοήθησον τὸν δοῦλον σου Νῖλον κτλ. → Lord, help your slave Nilos ... (mosaic inscription from 4th-cent. church in the Negev)
English (LSJ)
ίδος, ἡ, (διετής)
A space of two years, LXX 2 Ki.13.23, IGRom.4.850 (Laodicea ad Lycum).
Greek (Liddell-Scott)
διετηρίς: -ίδος, ἡ, (διετὴς) διάστημα δύο ἐτῶν, Ἑβδ. (2 Βασιλ. ιγ΄, 23).