ἐπισταδόν
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)
Adv., (ἐφίστημι, ἐπιστῆναι)
A standing over each in turn (ἐφιστάμενος ἑκάστῳ EM364.35), i.e. one after another, successively, νείκεον ἄλλοθεν ἄλλον ἐ. Od.12.392; νώμησεν δ' ἄρα πᾶσιν ἐ. 13.54; standing by, A.R.1.293; ἐ. οὐτάζοντες standing up to each other, Id.2.84.—The words of Od.16.453, δόρπον ἐ. ὡπλίζοντο, seem to have given rise to the other expl. of the Sch., ἐπισταμένως, ἐμπείρως (as if from ἐπίσταμαι).