Meaning of “contaminate” - Learner’s Dictionary

contaminate

verb [ T ] us uk /kənˈtæmɪneɪt/

to make something dirty or poisonous:

contaminated drinking water
contamination noun [ U ] us uk /kənˌtæmɪˈneɪʃən/

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