καθέτης
From LSJ
καὶ ὑποθέμενος κατὰ τῆς κεφαλῆς φέρειν τὰς πληγάς, ὡς ἐν ἐκείνῃ τοῦ τε κακοῦ τοῦ πρὸς ἀνθρώπους → and having instructed them to bring their blows against the head, seeing that the harm to humans ... (Josephus, Antiquities of the Jews 1.50)
English (LSJ)
ου, ὁ, prob.
A portcullis (v. πτερόν 111.9), Sch. E.Ph.114. II plummet, Aen.Tact.32.6 cod., Gloss.
Greek (Liddell-Scott)
καθέτης: ὁ, πιθαν. εἶδος θύρας καταρρακτῆς μετὰ σιδηρῶν ὀδόντων, ἣν ἀφίνουσι νὰ πέσῃ κατ’ ἐχθρῶν ἀπειλούντων νὰ εἰσέλθωσιν (ἴδε πτερὸν ΙΙΙ. 9), Σχόλ. εἰς Εὐρ. Φοιν. 114.