μηκυσμός
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
English (LSJ)
ὁ,
A lengthening, esp. of vowels, Eust.81.6.
German (Pape)
[Seite 172] ὁ, das Langmachen, das Langaussprechen der Vocale, Eust. 81, 6.