Medical Dictionary
2 ENTRIES FOUND:

atrium

noun atri·um \ˈā-trē-əm\
plural atria \-trē-ə\ also atri·ums

Medical Definition of ATRIUM

:  an anatomical cavity or passage; especially :  a chamber of the heart that receives blood from the veins and forces it into a ventricle or ventricles
April 27, 2015
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