DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   travelling waves /tɹˈavəlɪŋ wˈeɪvz/
   Wanderwellen <pl>, fortschreitende Wellen <pl>
      Synonyms: progressive waves, surges
    see: travelling wave, progressive wave, surge, transient wave