A device that removes excess moisture from the air in a room or building.
The prefix 'de-' (from Latin, meaning 'away from' or 'removal') combined with 'humidifier.' Ironically, dehumidifiers were invented before humidifiers - the first dehumidifier was patented in 1902, while humidifiers became popular much later. The technology emerged from industrial needs to protect machinery from rust and documents from mold, then moved into homes as people realized excess humidity caused health and comfort problems.
Dehumidifiers were invented before humidifiers, which seems backwards - we figured out how to remove moisture from air before we learned to add it back. This reflects early 20th-century industrial priorities: protecting expensive machines from rust mattered more than human comfort.
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