καθαρσιον
From LSJ
βωμὸν Ἀριστοτέλης ἱδρύσατο τόνδε Πλάτωνος, ἀνδρὸς ὃν οὐδ' αἰνεῖν τοῖσι κακοῖσι θέμις → Aristotle had this altar of Plato set up — Plato, a man whom the wicked dare not even mention in praise
Russian (Dvoretsky)
κᾰθαρσιον: τό
1 (sc. ἱερόν) очистительная жертва eschin.;
2 обряд очищения Her., pl. Eur., Plut.