ὀπισθόγραφος
From LSJ
Ἔπαινον ἕξεις, ἂν κρατῇς, ὧν δεῖ κρατεῖν → Laus est, si, quibus est imperandum, tu imperes → Lob hast du, wenn du herrschst, worüber zu herrschen gilt
English (LSJ)
ον,
A written on the back as well as the front, of papyrus rolls, Plin.Ep.3.5.17, Luc.Vit. Auct.9, Ulp.in Dig.37.11.4, Gloss.