to make pure; free from anything that debases, pollutes, adulterates, or contaminates

to purify metals.

to free from foreign, extraneous, or objectionable elements

to purify a language.

to free from guilt or evil.

to clear or purge (usually fol. by of or from ).

to make clean for ceremonial or ritual use.

to become pure.

adjective

expiatory , lustral , lustrative , purgatorial