atrium
nounUK /ˈeɪ.tri.əm/
US /ˈeɪ.tri.əm/
A big open room with a glass roof, often in the middle of a building.
We waited in the bright atrium of the hotel before checking in.
OTHER MEANINGS
2. One of the two upper chambers of the heart that receive blood.
The right atrium collects blood returning from the body.
3. A central open space in an ancient Roman house.
Guests gathered in the atrium of the Roman villa.
4. An open space surrounded by columns in front of a building.
The temple's atrium was lined with tall stone pillars.