See Also: Atrium(tourism)
atrium(medicine)
Atrium(health)
atrium(dictionary)
atrium(encyclopedia)
atrium(dictionary)
Right atrium(medicine)
Atrium Resort(tourism)
Atrium Biotechnologies(finance)
right atrium of heart(medicine)

atrium (iou)



atrium noun. , -iums. L16.
[Latin.]
Architecture. A central court, orig. that of an ancient-Roman house; a covered court or portico; (a building with) a large light-well; a central hall or glassed-in court in a building. L16.
Anatomy & Zoology. Any of various chambers into which one or more passages open; spec. (a) either of the two upper chambers of the heart (in fish, a single chamber), into which the veins conduct blood (cf. AURICLE 1); (b) the tympanic chamber of the ear. L19.
atrial adjective (Anatomy & Zoology) of or pertaining to an atrium M19.
atrioven'tricular adjective (Anatomy) of or pertaining to the atrial and ventricular chambers of the heart;
atrioventricular bundle, a bundle of nerves leading from the right atrium to the ventricles and serving to maintain the heartbeat: L19.