/ Dictionary / Index H humidifier: Meaning and Definition of Find definitions for: hu•mid•i•fi•er Pronunciation: (hy-mid'u-fī"ur or, often, y-), [key] — n. 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. any device for regulating the amount of water vapor in a specific container or area. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. humid humidify Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language