καθαίρω καθαρός of the person or thing purified, to make pure or clean, cleanse, clean, purge, καθήραντες χρόα ὕδατι Od.:— to purge, clear a land of monsters and robbers, Soph. in religious sense, to cleanse, purify, [δέπας ἐκάθηρε θεείωι purified it by fumigating with sulphur, Il.; καθ. τινὰ φόνου to purify him from blood, Hdt.; Δῆλον κ. Hdt.:—Mid. to purify oneself, get purified, Hdt.; οἱ φιλοσοφίαι καθηράμενοι Plat.:—so Pass., κεκαθαρμένος Hdt. to prune a tree, i. e. clear it of superfluous wood, NTest. metaph., = μαστιγόω, like our vulgar phrase "to rub down, " Theocr. of the thing removed by purification, to purge away, wash off or away, λύματα Il.; ῥύπα Od.; φόνον Aesch. c. dupl. acc., αἷμα κάθηρον Σαρπηδόνα cleanse Sarpedon of blood, wash the blood off him, Il.:—Pass., φόνον καθαρθείς Hdt.