ionizer

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++

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i·on·i·zer (also ioniser British English) /ˈaɪənaɪzə $ -ər/ noun [countable]  TDHa machine used to make the air in a room more healthy by producing negative ions 负离子发生器〔用于使室内空气清新〕

i·on·i·zer nounChineseSyllable  

ionizer
i‧on‧i‧zer (also ioniser British English) /ˈaɪənaɪzə $ -ər/ noun [countable]
a machine used to make the air in a room more healthy by producing negative ions

ion·izer (BrE also ion·iser) BrE /ˈaɪənaɪzə(r)/ 🔊NAmE /ˈaɪənaɪzər/ 🔊 nouna device that is used to make air in a room fresh and healthy by producing negative ions 负离子发生器；离子化装置