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

 

oxidant

 noun
noun
BrE BrE//ˈɒksɪdənt//
 
; NAmE NAmE//ˈɑːksɪdənt//
 
(chemistry)
 
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a substance that makes another substance combine with oxygen Word Origin late 19th cent.: from French (modern French oxydant), present participle of oxider ‘oxidize’.
See the Oxford Advanced American Dictionary entry: oxidant