μεσόβραχυς
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)
υ,
A having a short syllable in the middle, name of the foot, Diom.p.481 K.
Greek (Liddell-Scott)
μεσόβραχυς: ποὺς ἐν τῇ μετρ. ἐκ δύο μακρῶν καὶ βραχείας καὶ δύο μακρῶν, χρόνων ἐννέα, Diom. ἐν Gram. Lat. ed. Keil I, σ. 481.