What does "humidifier" mean?

A device that is used to increase the humidity of the air.

Humidifier

Common synonyms include: humidification system, humidifying device, humidity control, humidity generator, industrial humidifier, medical humidifier.

noun

noun ·5 syllables ·Rare ·Advanced level

Noun

1
A device that is used to increase the humidity of the air.
"Even the plants look expensive. A humidifier hisses beneath her calatheas."
2
an appliance designed to add moisture to the air in a building wordnet

"But because the humidifier is on all night, in the morning the condensation pours off the windows."

From humidify + -er.