LSJ
ακος, ὁ, an officer who had charge of the municipal wines, Michel 1226 (Cyzic.), CIG 3663 A 14 (ibid.), JHS 22.206 (ibid.), Milet.3 p. 177 No.33e5.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ακος, ὁ, Weinhüter, Schol.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)