pesnis
From LSJ
ἀσκεῖν περὶ τὰ νοσήματα δύο, ὠφελεῖν ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
Latin > English (Lewis & Short)
pesnis: for pennis, acc. to Fest. p. 205 Müll.; v. penna.
Latin > French (Gaffiot 2016)
pesnis = pennis : Fest. 205.