σκοτομηνία
From LSJ
τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
English (LSJ)
ἡ,= foreg., Chrysipp.Stoic.2.212, Aq.Jb.3.
German (Pape)
[Seite 905] ἡ, mondfinstere, mondlose, dunkle Nacht, Sp.