βαυκάλιον
From LSJ
ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers
English (LSJ)
τό,
A narrow-necked vessel, that gurgles when water is poured in or out, POxy.936.6 (iii A. D.), Olymp. in Mete.93.6: pl., Alex.Aphr.Pr.1.94 (καυκ- codd.).