ὀπισθέναρ
From LSJ
ἀνιαρῶς τε φέρει τὴν τελευτὴν, καίτοι γε τὸν πρόσθεν χρόνον διαχλευάζων τοὺς μορμολυττομένους τὸν θάνατον, καὶ πρᾴως ἐπιτωθάζων → he bears death with grief, although in a former time he criticized, and mildly derided, those that were fearing death
English (LSJ)
ᾰρος, τό,
A the back of the hand, Poll.2.143, 144, 9.126.
German (Pape)
[Seite 358] αρος, τό, der Rücken der flachen Hand, Hippocr. u. Sp., vgl. Lob. zu Phryn. 870.