Meaning of “purify” - Learner’s Dictionary

purify

verb [ T ] us uk /ˈpjʊərɪfaɪ/

to remove bad substances from something to make it pure:

Plants help to purify the air.
purified water
purification noun [ U ] us uk /ˌpjʊərɪfɪˈkeɪʃən/

(Definition of “purify” from the Cambridge Learner’s Dictionary © Cambridge University Press)