aorta

Science Dictionary
aorta   (ā-ôr'tə)  Pronunciation Key 
Plural aortas or aortae (ā-ôr'tē)
The main artery of the circulatory system, arising from the left ventricle of the heart in mammals and birds and carrying blood with high levels of oxygen to all the arteries of the body except those of the lungs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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