nebulizer Syllabification: (neb·u·liz·er)Pronunciation: /ˈnebyəˌlīzər/Definition of nebulizer noun a device for producing a fine spray of liquid, used for example for inhaling a medicinal drug. Derivatives nebulize verb Origin: late 19th century: from Latin nebula 'mist' + -izer (see -ize)nebulizer in other Oxford dictionaries Definition of nebulizer in the British & World English dictionary