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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. examples
(figuratively) The liveliest part of something. quotations examples
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.
2007 January 26, Stefan Kanfer, “In Lower Manhattan, the Echo of the Yiddish Stage Endures”, in The New York Times