Source : Webster's Revised Unabridged Dictionary (1913)

Arterial \Ar*te"ri*al\, a. [Cf. F. art['e]riel.]
   1. Of or pertaining to an artery, or the arteries; as,
      arterial action; the arterial system.

   2. Of or pertaining to a main channel (resembling an artery),
      as a river, canal, or railroad.

   {Arterial blood}, blood which has been changed and vitalized
      (arterialized) during passage through the lungs.

Source : WordNet®

arterial blood
     n : blood found in arteries; "except for the pulmonary artery
         the arterial blood is rich in oxygen"