DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Rotationskolbenmotor /rˌoːtatsjˌoːnskɔlbənmˈoːtoːɾ/ (RKM /ˌɛɾkˌɑːˈɛm/) <masc, n, sg>
   rotary piston engine <n>
      Synonym: Kreiskolbenmotor
    see: Rotationskolbenmotoren, Kreiskolbenmotoren