Webster's English Dictionary

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aorta

aor.ta \a--'o.rt-*\ \-'o.r-.te--\ \-'o.rt-*l\ \-'o.rt-ik\ n or aortas or 
   aor.tae [NL, fr. Gk aorte-, fr. aeirein to lift] pl  : the great trunk 
   artery that carries blood from the heart to be distribut ed by branch 
   arteries through the body - aor.tal aj