DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   faying surfaces /fˈeɪɪŋ sˈɜːfɪsɪz/
   Kontaktbereiche <pl>, Kontaktflächen <pl>
      Synonyms: contact areas, junction surfaces
    see: contact area, junction surface, faying surface