|atrium (ˈeɪtrɪəm, ˈɑː-)|
|—n , pl atria|
|1.||the open main court of a Roman house|
|2.||a central often glass-roofed hall that extends through several storeys in a building, such as a shopping centre or hotel|
|3.||a court in front of an early Christian or medieval church, esp one flanked by colonnades|
|4.||anatomy a cavity or chamber in the body, esp the upper chamber of each half of the heart|
|[C17: from Latin; related to āter black, perhaps originally referring to the part of the house that was blackened by smoke from the hearth]|
atrium a·tri·um (ā'trē-əm)
n. pl. a·tri·ums or a·tri·a (ā'trē-ə)
A chamber or cavity to which several chambers or passageways are connected.
Either the right or the left upper chamber of the heart that receives blood from the veins and forces it into a ventricle.
That part of the tympanic cavity that lies below the eardrum.
A subdivision of the alveolar duct in the lung from which the alveolar sacs open.