δερριστήρ

From LSJ

ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers

Source

Spanish (DGE)

-ῆρος, ὁ
collar para caballos y otros animales, dogal Hsch., cf. δερβιστήρ.