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nebulizer

British  
/ ˈnɛbjʊˌlaɪzə /

noun

  1. Also called: inhalator.  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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

nebulizer Scientific  
/ nĕbyə-lī′zər /
  1. A device that reduces liquid to an extremely fine cloud, especially used for delivering medication to the deep part of the respiratory tract.