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Definition of: atrium
(ā′trē·əm) noun plural a·tri·a (ā′trē·ə)
1. The entrance hall or central open court of an ancient Roman house.
2. A court or hall.
3. Anat. One of the upper chambers of the heart through which venous blood is transmitted to the ventricles: also called auricle.
4. Zool. A cavity or sac.
—atrium of infection Med. Any opening affording bacterial infection. [<L (def. 1)]
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