noun
dehumidifier
A device that removes moisture from the air; commonly used in homes to prevent mold and dampness.
梅雨の時期は除湿機が欠かせません。
A dehumidifier is essential during the rainy season.
加湿器 is a humidifier, which adds moisture to the air, the opposite of 除湿機.
Compound of 除湿 (dehumidification) + 機 (machine).