- The aorta is defined as the main artery of the body, transporting blood out of the heart to the smaller arteries that distribute it to the limbs and all organs except for the lungs.
An arterial blood vessel that takes blood from the heart to the rest of the body is an example of an aorta.
nounpl. a·or·tas or a·or·tae
Origin of aortaNew Latin, from Greek āortē, from āeirein, to lift; see wer-1 in Indo-European roots.
- a·or′tal, a·or′tic
A. arch of aorta
B. abdominal aorta
(plural aortas or aortae)
- (anatomy) 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.
- (figuratively) The liveliest part of something.
- Tracing their battles, I had many occasions to walk along Second Avenue, the aorta of the Lower East Side, exploring places that were once as vibrant and tumultuous as Midtown Manhattan. 
From Ancient Greek ἀορτή (aortē, “the arteries springing from the heart”), from ἀορτέω (aorteō), lengthened form of ἀείρω (aeirō, “I lift, raise”)