πλακούντιον
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
τό, Dim. of πλακοῦς, Arr.Epict.2.16.25, Aët.9.30, Sch.Porph.Abst.2.16 :— written πλᾰκουντ-όντιον, PLond.3.964.20 (iii A.D.).
