Webster's English Dictionary

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vagus

va.gus \'va--g*s\ \'va--.gi-, -.ji-\ n or va.gi [NL vagus nervus, lit., 
   wandering nerve] pl  : either of the tenth pair of cranial nerves arising 
   from the medulla and  supplying chiefly the viscera esp. with autonomic 
   sensory and motor fibers