ὑδροφαντική
From LSJ
ἄπαγ' ἐς μακαρίαν ἐκποδών → get lost, buzz off, on yer bike, bug off, bugger off, clear out, clear off, take a hike, beat it, scram, get out of here, get outta here
English (LSJ)
(sc. τέχνη), ἡ, the art of discovering water, Gp. 2.6.1; also ὑδροφαντικά, τά, ibid.
German (Pape)
[Seite 1174] ἡ, sc. τέχνη, die Kunst, verborgenes Wasser zu entdecken.