society > inhabiting and dwelling > inhabited place > a building > parts of building > window or door > types of window > [noun] > louvre or lantern > for ventilation (2)
A structure, typically in the shape of a dome and having lateral openings, placed on the roof over a hall, kitchen, etc., for ventilation or to allow…
a dome-shaped ventilation outlet (esp. on a ship or other form of transport), spec. one which allows the flow of air to be adjusted or directed…