ὀρνεοπωλεῖον

From LSJ

αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point

Source

German (Pape)

[Seite 382] τό, Ort, wo Vögel verkauft werden, Schol. Ar. Av. 13.