κλειδίον
From LSJ
Λιμὴν ἀτυχίας ἐστὶν ἀνθρώποις τέχνη → Ars est hominibus portus infortunii → Vor Unglück bietet Menschen Zuflucht Kunstverstand
English (LSJ)
(on the accent v. Hdn.Gr.1.356), τό, Dim. of κλείς,
A little key, κλειδία . . Λακωνίκ' ἄττα, τρεῖς ἔχοντα γομφίους Ar.Th.421, cf. Fr. 16, IG22.1533.27 (iv B.C.); τὸ κ. τοῦ οἰκήματος Arist.Mir.832b23: without dimin. sense, τὰ κ. τῶν οὐρανῶν Porph.Chr.26. 2 stopcock, Hero Spir.1.24, POxy.2146.7 (iii A.D.). II = κλείς 111, of the tunny, Ath.7.315d; cf. κλιδία. III a kind of astringent pill, Gal.13.87,290, Paul.Aeg.3.40; or astringent suppository, κ. ὑπόθετον Alex.Trall.9.3. (κλῃδ- is not found.)