DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Stickoxid /ʃtˌɪkɔksˈiːt/ (NOx /nˈɔks/) <neut, n, sg>
    [chem.] nitrogen oxide <n>NOx,  /nˈɔks/
      Synonym: Stickstoffoxid
    see: Stickstoffoxide, Stickoxide