δίπλευρος
From LSJ
Ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → It is impossible to know the spirit, thought, and mind of any man before he be versed in sovereignty and the laws
English (LSJ)
ον,
A with two fronts, Ael.Tact.36.4, Arr.Tact.28.4.
Greek (Liddell-Scott)
δίπλευρος: -ον, ἔχων δύο πλευράς, Ἀρρ. Τακτ. 66.