DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Folioformat /fˌoːlɪˌoːfɔɾmˈɑːt/ <neut, n, sg>
   folio format <n>, folio <n>fo,  /fˈoː/ 2°,  /tsvˈaɪ/
            Note: book size
      Synonym: Folio