Etymology
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dehumidifier (n.)

"device for removing humidity from the air," 1909, agent noun from dehumidify (1908); see de- + humidify.

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Definitions of dehumidifier

dehumidifier (n.)
an applicance to extract moisture from the air and make the environment more comfortable;
in summer, we need to run the dehumidifier in the basement
From wordnet.princeton.edu