[hyoo-mid-uh-fahy-er or, often, yoo-]
  1. a device for increasing the amount of water vapor in the air of a room or building, consisting of a container for water and a vaporizer.
  2. any device for regulating the amount of water vapor in a specific container or area.

Origin of humidifier

First recorded in 1880–85; humidify + -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for humidifier


  1. a device for increasing or controlling the water vapour in a room, building, etc
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

Word Origin and History for humidifier

1884, agent noun from humidify.

Online Etymology Dictionary, © 2010 Douglas Harper