Devices or substances that remove fog or condensation from surfaces like windows or mirrors.
From de- (remove) + fog + -er (agent noun). 'Fog' comes from Old Norse 'fuggr' meaning spray or mist. The modern compound emerged in the 20th century as automotive and household technology advanced.
Car defoggers use rear-window heating grids or front-windshield air systems—different strategies for the same problem. The rear defogger invention was patented in the 1960s and became a breakthrough for driver safety in humid conditions.
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