ἐπίφραξις
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)
εως, ἡ, (ἐπιφράσσω)
A obstruction of the earth, in eclipses, Plu.2.891f, Anaximand.11.
German (Pape)
[Seite 1001] ἡ, Verstopfung, Plut. plac. phil. 2, 29.