Cultural Dictionary
atria [(ay-tree-uh)]

sing. atrium (ay-tree-uhm)

The two upper chambers in the heart, which receive blood from the veins and push it into the ventricles. (See circulatory system.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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