The Collaborative International Dictionary of English v.0.48:

Estoile \Es`toile"\, n. [OF.] (Her.)
   A six-pointed star whose rays are wavy, instead of straight
   like those of a mullet. [Written also ['e]toile.]
   [1913 Webster]

   Estoile of eight points, a star which has four straight and
      four wavy rays.

   Estoile of four points. Same as Cross estoil['e], under
      Cross.
      [1913 Webster]