ὑδᾰτ-ικός · hydat-ikos — LSJ
derived from water-rights, of waters
= sq., σημεῖον Thphr. Sign. 11, 17; πρόσοδος revenue derived from water-rights, PSI 2.160.7 (ii A. D.); πόρος Sch. Ar. Pl. 521; ἡ ὑ. σφαῖρα the globe of waters, in reference to tidal phases, Nicom. ap. Theol.Ar. 45.