πορνίδιον
From LSJ
Ποιητὴς, ὁπόταν ἐν τῷ τρίποδι τῆς Μούσης καθίζηται, τότε οὐκ ἔμφρων ἐστίν → Whenever a poet is seated on the Muses' tripod, he is not in his senses
English (LSJ)
τό, Dim. of foreg., Ar.(v. infr.), etc. [πορνῐδῐον, Ar.Nu.997, Men. Pk.150, Com.Adesp.120, but -ῑδῐον (Dim. of Πορνίον), Ar.Ra. 1301.]