ὀπισθόγραφος
From LSJ
πολλὰ γάρ σε θεσπἰζονθ' ὁρῶ κοὐ ψευδόφημα (Sophocles' Oedipus Coloneus 1516f.) → For I see in you much prophecy, and nothing false
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.