συναλλακτής
From LSJ
χαῖρ', ὦ μέγ' ἀχρειόγελως ὅμιλε, ταῖς ἐπίβδαις, τῆς ἡμετέρας σοφίας κριτὴς ἄριστε πάντων → all hail, throng that laughs untimely on the day after the festival, best of all judges of our poetic skill
English (LSJ)
οῦ, ὁ,
A mediator, negotiator, Id. II an official concerned with the tax on sales (?), POxy.43vii 4, al. (iii A.D.).