Definition of "humidify" [humidify]

• To make humid. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Green walls are not only spectacularly beautiful, but they also help enliven a space, humidify the air, and process toxins."
• "A friend of mind told me he read someplace to put it in the fridge, after all they do de-humidify."
• "This is basically what this elements in the pictures below do: they humidify the air and make it more “breathable”."