ἐλεγκτήρ
From LSJ
τὸ ἐγδοχῖον τοῦ ὕδατος καὶ τὰ ἐν τῆι πόλει ὑδραγώγια → the water reservoir and the conduits in the city (or on the acropolis)
English (LSJ)
ῆρος, ὁ,
A one who convicts or detects, τῶν ἀποκτεινάντων Antipho 2.4.3.
German (Pape)
[Seite 793] ῆρος, ὁ, der Ueberführer, Antiph. II δ 5, wo sonst ἐλεγκτής stand.