無む双そう窓まど

noun

openable panel in a door; door panel that can be opened

Architectural term for a small hinged or sliding panel set within a larger door, allowing ventilation or a view without opening the whole door.

• 古ふるい日本にほん家か屋おくの玄げん関かんには、無む双そう窓まどが付ついていることがある。

  The entrance of old Japanese houses sometimes has an openable panel in the door.