σύνθηρος

ον, Subst.
A. hunting with, τῷ Κύρῳ X. Cyr. 3.1.7; ς. κύνες hunting with (Artemis), AP 9.303 (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.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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