G2512 καθαρισμός (katharismós)

KJV renderings: cleansing, + purge, purification(-fying)
Strong's definition: a washing off, i.e. (ceremonially) ablution, (morally) expiation
Derivation: from G2511 (καθαρίζω);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.