atrium

Science Dictionary
atrium   (ā'trē-əm)  Pronunciation Key 
Plural atria or atriums
A chamber of the heart that receives blood from the veins and forces it by muscular contraction into a ventricle. mammals, birds, reptiles, and amphibians have two atria; fish have one.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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