DuckCorp

DuckCorp Dico

(RFC 2229 compliant dictionary server)
more options

Found one definition 

  1.                 From WordNet (r) 3.0 (2006):
                

    
                
                  
    RAS
    n 1: the network in the reticular formation that serves an
         alerting or arousal function [syn: reticular activating
 system, RAS]