ὑπέρθυρον
From LSJ
ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English (LSJ)
τό, = ὑπερθύριον (lintel, lintel of a door or lintel of a gate).
Greek Monotonic
ὑπέρθῠρον: τό, = το προηγ., σε Ηρόδ.
Russian (Dvoretsky)
ὑπέρθῠρον: τό верхний дверной брус, притолока Her., Arst., Plut.