σφυρίον
From LSJ
ἔκβαλε πρῶτον ἐκ τοῦ ὀφθαλμοῦ σοῦ τὴν δοκόν, καὶ τότε διαβλέψεις ἐκβαλεῖν τὸ κάρφος ἐκ τοῦ ὀφθαλμοῦ τοῦ ἀδελφοῦ σου → first take the plank out of your own eye, and then you will see clearly to remove the speck from your brother's eye
English (LSJ)
τό,
A = σφυρίδιον, POxy.1658.6 (iv A.D.), etc.
σφῡρίον, τό, also proparox. σφύριον, Dim. of σφῦρα,
A small hammer, mallet, Thphr.HP5.7.8, PCair.Zen.759 (iii B.C.), Ph.Bel.65.40, Heliod. ap. Orib.46.11.28.
German (Pape)
[Seite 1052] τό, falsch σφύριον betont, dim. von σφῦρα, kleiner Hammer, Schlägel, Chirurg. vett.