τὸ ἐγδοχῖον τοῦ ὕδατος καὶ τὰ ἐν τῆι πόλει ὑδραγώγια → the water reservoir and the conduits in the city (or on the acropolis)
-ίδος, ἡsirvienta, EMα 113, Et.Sym.α 74, Zonar., cf. ἐγκονίς.