Source : Webster's Revised Unabridged Dictionary (1913)

Frounce \Frounce\, v. i. [imp. & p. p. {Frounced}; p. pr. & vb.
   n. {Frouncing}.] [OE. frouncen, fronsen, to told, wrinkle,
   OF. froncier, F. froncer, perh. fr. an assumed LL. frontiare
   to wrinkle the forehead, L. frons forehead. See {Front}, and
   cf. {Flounce} part of a dress.]
   To gather into or adorn with plaits, as a dress; to form
   wrinkles in or upon; to curl or frizzle, as the hair.

         Not tricked and frounced, as she was wont. --Milton.

Frounce \Frounce\, v. i.
   To form wrinkles in the forehead; to manifest displeasure; to
   frown. [Obs.]

         The Commons frounced and stormed.        -- Holland.

Frounce \Frounce\, n.
   1. A wrinkle, plait, or curl; a flounce; -- also, a frown.
      [Obs.] --Beau. & Fl.

   2. An affection in hawks, in which white spittle gathers
      about the hawk's bill. --Booth.