1. [NA]. A chamber or cavity to which are connected several chambers or passageways.
2. Syn: atrium of heart.
3. That part of the tympanic cavity that lies immediately deep to the eardrum.
4. Syn: nasal atrium.
5. In the lung, a subdivision of the alveolar duct from which alveolar sacs open.
Origin
[L. entrance hall]
accessory atrium
auricle of atrium
atrium cordis
atrium dextrum cordis
atrium glottidis
atrium of heart
left atrium of heart
atrium meatus medii
nasal atrium
atrium pulmonale
right atrium of heart
atrium sinistrum cordis