Meaning of 加湿器 in Japanese

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Definition of 加湿器

かしつき(kashitsuki) 【加湿器 ·加湿機】

(n) humidifier
けど、一晩加湿器つけっぱなしで朝になると窓が結露してドボドボ・・・。
But by leaving the humidifier on all night in the morning condensation's pouring off the windows ...