κηλάς
From LSJ
Ῥῆμα παράκαιρον τὸν ὅλον ἀνατρέπει βίον → Vitae lues vox missa non in tempore → Ein Wort zur Unzeit stülpt das ganze Leben um
English (LSJ)
άδος, ἡ, prop.
A mottled (cf. κηλίς), of clouds denoting wind, not rain, Thphr.Sign.31, prob.in 51: hence κ. ἡμέρα a windy day, Hsch., dub. in Call.Fr.63 P. II κηλὰς αἴξ, ἡ, a she-goat with a mark (σημεῖον τυλοειδές) on her forehead, Hsch.