καθάριον
From LSJ
θοῦ, Κύριε, φυλακὴν τῷ στόµατί µου καὶ θύραν περιοχῆς περὶ τὰ χείλη µου → set a guard over my mouth, Lord; keep watch over the door of my lips | set a guard, O Lord, over my mouth; keep watch over the door of my lips (Psalm 140:3, Septuagint version)
English (LSJ)
τό, purgative medicine, POxy. 116.15 (ii AD).
Russian (Dvoretsky)
κᾰθάριον: τό Plut. = καθαριότης.