σινδόνιον
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)
τό,
A curtain, garment, etc., made of σινδών, IG 42(1).118.67 (Epid., iii B.C.), Gal.Protr.10, Poll.7.73, D.C.79.13, POxy.921.15 (iii A.D.), Sammelb.7033.40 (v A.D.).