ὑδρομαντεία
From LSJ
τὸ δὲ ποιεῖν ἄνευ νοῦ ἃ δοκεῖ καὶ σὺ ὁμολογεῖς κακὸν εἶναι: ἢ οὔ → but doing what one thinks fit without intelligence is—as you yourself admit, do you not?—an evil
English (LSJ)
ἡ,
A water-divination, Augustin.De Civ.Dei 7.35.
Greek (Liddell-Scott)
ὑδρομαντεία: ἡ, ἡ δι’ ὕδατος μαντεία, Αὐγουστῖνος VII, 305 (188) Β.