aorta -
The great artery which carries the blood from the heart to all parts of the body except the lungs; the main trunk of the arterial system.
aorta -
The liveliest part of something.
Wikipedia
The aorta (from Greek ἀορτή - aortē, from ἀείρω - aeirō "I lift, raise") is the largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, where it branches off into two smaller arteries. The aorta distributes oxygenated blood to all parts of the body through the systemic circulation.
OmegaWiki Dictionary
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aorta The main trunk of the arterial system, conveying blood from the left ventricle of the heart to all of the body except the lungs.