デフォッガー

noun

defogger

A device that removes condensation from a surface, most commonly a car's rear window defogger.

• 寒さむい朝あさは、車くるまのデフォッガーをつけて窓まどの曇くもりを取とる。

  On cold mornings, I turn on the car's defogger to clear the fog from the windows.