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

 

ionizer

 noun
(British English also -iser)noun
BrE BrE//ˈaɪənaɪzə(r)//
 
; NAmE NAmE//ˈaɪənaɪzər//
 
 
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a device that is used to make air in a room fresh and healthy by producing negative ions
See the Oxford Advanced American Dictionary entry: ionizer