ἰδιομήκης
From LSJ
Ῥῦσέ με δεινῶν νοσημάτων, ἱερώτατε, ἱερωσύνην συναρμόσας ἐν χαρᾷ και ἐπιστήμης τὸ πολύτιμον κεφάλαιον → Deliver me from grievous afflictions, most holy one, joining sanctity together in joy with the precious fountainhead of knowledge
English (LSJ)
ες,
A of their own length, i.e. of the same length each way, of square numbers, Nicom.Ar.2.18.
German (Pape)
[Seite 1236] ες, von eigener Länge; von Zahlen, wie 4 = 2. 2, Nicom. arithm. 2, 18.