Panionium
From LSJ
ταῦτα δηλώσω αὐτός τε νοσήσας καὶ αὐτὸς ἰδὼν ἄλλους πάσχοντας → I shall describe those symptoms, since I myself had the disease and witnessed as well what others were suffering
Latin > French (Gaffiot 2016)
Pănĭōnĭum, ĭī, n. (Πανιώνιον), la réunion de tous les Ioniens : Mela 1, 87 || -ius, a, um, de toute l’Ionie : Plin. 5, 113 ; Vitr. Arch. 4, 1.