περικάθαρσις
From LSJ
Καὶ τῶν λεγόντων εὖ καλὸν τὸ μανθάνειν → It is a fine thing to learn from those who speak well
English (LSJ)
εως, ἡ,
A clearing round, τῶν ῥιζῶν Thphr.CP5.9.11 (pl.).
Greek (Liddell-Scott)
περικάθαρσις: ἡ, τὸ καθαίρειν κύκλῳ, περικαθάρισμα, τῶν ῥιζῶν Θεοφρ. π. Φυτ. Αἰτ. 5. 9. 11.