DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Ces /kˈeːs/ <neut, n, sg>
   C <n>, C sharp <n>, C flat <n>, C double sharp <n>, C double flat <n>
      Synonyms: C, Cis, Cisis, Ceses