atriums

noun pl. atria or atriums

1. the central court or main room of an ancient Roman house
2. a hall or court at the center or entrance of a building, usually rising through more than one story or all the stories and having a skylight or glass on one side and the roof
3. Anat. a chamber or cavity, esp. either of the thin-walled upper chambers of the heart that receive blood; auricle