Webster's English Dictionary

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arterial

1. ar.te.ri.al \a:r-'tir-e--*l\ \-*-le-\ aj 1a: of or relating to an artery 
    1b: relating to or being the bright red blood present in most arteries tha 
   t has been oxygenated in lungs or gills 2: of, relating to, or constituting 
   through-traffic facilities  - ar.te.ri.al.ly av
2. arterial n : a through street or arterial highway