ὑποσιδηρόω
From LSJ
ὑπὸ δὲ τῆς φιλαυτίας παρηγμένοι ἄλογα φασὶν τὰ ζῷα ἐφεξῆς τὰ ἄλλα σύμπαντα → it is self-love which leads them to say that all the other animals without exception are non-rational
English (LSJ)
in pf. part. Pass., δακτύλιοι χρυσοῖ -σεσιδηρωμένοι, i.e. iron rings gilded, Inscr.Délos399B14 (ii B. C.).