ἐπιίστωρ

A. privy to a thing: c.gen., μεγάλων ἔργων ἐ. privy to great works (i.e. the robbery of the mares), Od. 21.26; so τεῶν μύθων ἐ. A.R. 4.89: abs., ib.16.

2. . acquainted with, practised in, δίσκων, γεωμετρίης, AP 11.371 (Pall.), App.Anth. 7.2 (Euc.); σοφίης IG 3.946, cf. Doroth.in Cat.Cod.Astr. 2.172.