κᾰθάρ-σιος · kathar-sios — LSJ
cleansing from guilt or defilement, purifying, Ζεύς Hdt. 1.44, cf. Arist. Mu. 401a23, etc.; of Dionysus, μολεῖν καθαρσίῳ ποδί S. Ant. 1144 (lyr.); of sacrifice, αἷμα A. Eu. 449, Th. 680; πῦρ E. HF 937, IA 1112, J. AJ 20.8.5, al.; φλόξ E. Hel. 869; προχύται Id. IA 1471: c. gen., [Λοξίας] δωμάτων κ. A. Eu. 63; ἱερὰ κ. οἴκων E. HF 923; also κ. φόνου cleansing from . . , A. Eu. 578.
as Subst.,
καθάρσιον (sc. ἱερόν), τό, purificatory offering, Aeschin. 1.23, cf. Phot.: pl., BMus.Inscr. 481*.280: hence, expiation, καθαρσίου ἐδέετο κυρῆσαι Hdt. 1.35, cf. Jul. Or. 2.58d.
(sc. φάρμακον) purge, Alex.Trall. 1.15, POxy. 1384.1 (v A.D.), Phlp. in Ph. 318.12.
καθάρσια, τά, = Lat. illuvies, Gloss. (nisi leg. ἀκαθαρσία).