Frenchism--prophetes.ai

Frenchism
  (ˈfrɛnʃɪz(ə)m)
  [f. French a. + -ism.]
  A French custom, idiom, or characteristic; a Gallicism.

1750 H. Walpole Lett. H. Mann (1834) II. 306 It is very amusing though very full of Frenchisms.

Oxford English Dictionary