nebulizer

n. one who makes vaporous; one who obscures; atomizer, device that creates and throws an aerosol spray (also nebuliser)

In medicine, a nebulizer is a device used to administer medication to people in forms of a liquid mist to the airways. It is commonly used in treating cystic fibrosis, asthma, and other respiratory diseases.Also called "atomizers", they pump air or oxygen through a liquid medicine to turn it into a vapor, which is then inhaled by the patient.As a general rule, doctors generally prefer to prescribe inhalers for their patients, not only because these are cheaper and more portable, but are often less potent and carry less risk of side effects. Nebulizers, for that reason, are usually reserved only for serious cases of respiratory disease, or severe attacks.
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Nebulizer /neb·u·liz·er/ atomizer ; a device for throwing a spray. neb·u·liz·er n. A device used to reduce liquid to an extremely fine cloud, [more]Nebulizer - Community and Resources

(n.)
An atomizer.
  

noun
instrument which sprays liquid in the form of very small drops like mist
NOTE: also called a nebulizer