noun
Refers to a central open space in a building, often with a glass roof, or to an anatomical chamber of the heart.
ホテルのアトリウムには大きな噴水がある。
There is a large fountain in the hotel's atrium.
心臓のアトリウムは血液を受け取る部屋です
The atrium of the heart is the chamber that receives blood.