σύνθηρος
From LSJ
καὶ ὑποθέμενος κατὰ τῆς κεφαλῆς φέρειν τὰς πληγάς, ὡς ἐν ἐκείνῃ τοῦ τε κακοῦ τοῦ πρὸς ἀνθρώπους → and having instructed them to bring their blows against the head, seeing that the harm to humans ... (Josephus, Antiquities of the Jews 1.50)
English (LSJ)
ον,
A hunting with, τῷ Κύρῳ X.Cyr.3.1.7; σ. κύνες hunting with (Artemis), AP9.303 (Adaeus): as Subst., σ. Ἀρτέμιδος her fellowhuntress, Apollod.3.8.2: c. gen. object., joining in quest of, τῶν ἀγαθῶν φίλων X.Mem.2.6.35.
German (Pape)
[Seite 1025] mit, zugleich, zusammen jagend; κύνες, Add. 4 (IX, 303); Xen. Cyr. 3, 1, 7.