χειροσίδηρον
From LSJ
φιλοσοφώτερον καὶ σπουδαιότερον ποίησις ἱστορίας ἐστίν: ἡ μὲν γὰρ ποίησις μᾶλλον τὰ καθόλου, ἡ δ' ἱστορία τὰ καθ' ἕκαστον λέγει → poetry is something more scientific and serious than history, because poetry tends to give general truths while history gives particular facts
German (Pape)
[Seite 1346] τό, = σιδηρᾶ χείρ, wie Bekker Poll. 2, 152 lies't, Eisenhand, eine Art Haken, Conj. für das Vorige.