nebulizer meaning
noun. 1  a device for converting a drug in liquid form into a mist or fine spray which is inhaled through a mask to provide medication for the respiratory system. 2  A nebulizer is a device used to administer medication in the form of a mist inhaled into the lungs. In a nebulizer, a pump pressurizes the air, then dispenses the medication in a fine mist. A nebulizer changes medication from a liquid to a mist so that it can be inhaled more easily. A nebulizer is a device used to administer medication in the form of a mist inhaled into the lungs. Collins English Dictionary.