Pronunciation: (ā-ôr'tu), [key]
—pl. -tas, -taePronunciation: (-tē). [key] Anat.
the main trunk of the arterial system, conveying blood from the left ventricle of the heart to all of the body except the lungs. See illus. under heart.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.