πεντέχους
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
English (LSJ)
ουν,
A holding five χόες, ὑδρία Ar. Fr. 136.
Greek (Liddell-Scott)
πεντέχους: ουν, χωροῦσα πέντε χόας, ὑδρίαν πεντέχουν Ἀριστοφ. Ἀποσπ. 183.