The Collaborative International Dictionary of English v.0.48:

Flour \Flour\, v. t. [imp. & p. p. Floured; p. pr. & vb. n.
   Flouring.]
   1. To grind and bolt; to convert into flour; as, to flour
      wheat.
      [1913 Webster]

   2. To sprinkle with flour.
      [1913 Webster]