The Collaborative International Dictionary of English v.0.48:

Persiennes \Per`si*ennes"\ (p[~e]r`s[i^]*[e^]nz"; F.
   p[~e]r`sy[e^]n"), n. pl. [F.]
   Window blinds having movable slats, similar to Venetian
   blinds.
   [Webster 1913 Suppl.]