Definition of contaminant noun from the Oxford Advanced Learner's Dictionary

 

contaminant

 noun
noun
BrE BrE//kənˈtæmɪnənt//
 
; NAmE NAmE//kənˈtæmɪnənt//
 
(specialist)
 
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a substance that makes something impure Filters do not remove all contaminants from water.
See the Oxford Advanced American Dictionary entry: contaminant