ον,
A secretly flowing, name of a stream at Athens, which flowed some distance under ground, Hsch.
κλεψίρρῠτος: -ον, ὁ λάθρα ρέων, ὄνομα ῥύακος ἐν Ἀθήναις ὅστις ἐφ’ ἱκανὸν διάστημα ῥέει ὑπὸ τὴν γῆν, Ἡσύχ.