καθάρτρια
From LSJ
λέγεται δὲ καὶ κλῶνας αὐτῆς θύραις ἢ θυρίσι προστεθέντας ἀποκρούειν τὰς τῶν φαρμάκων κακουργίας → its branches attached to doors or windows are said to repel the evil of spells
English (LSJ)
ἡ, fem. of καθαρτής, Sch.Pi.P.3.139.
German (Pape)
[Seite 1282] ἡ, fem. zu καθαρτής, Schol. Pind. P. 3, 139.