flourn.[F. fleur de farine the flower (i.e., the best) of meal, cf. Sp. flor de la harina superfine flour, Icel. flr flower, flour. See Flower.] The finely ground meal of wheat, or of any other grain; especially, the finer part of meal separated by bolting; hence, the fine and soft powder of any substance; as, flour of emery; flour of mustard.()Flour bolt, in milling, a gauze-covered, revolving, cylindrical frame or reel, for sifting the flour from the refuse contained in the meal yielded by the stones. -- Flour box a tin box for scattering flour; a dredging box. -- Flour dredge or Flour dredger, a flour box. -- Flour dresser, a mashine for sorting and distributing flour according to grades of fineness. -- Flour mill, a mill for grinding and sifting flour.()v. t.1. To grind and bolt; to convert into flour; as, to flour wheat.()2. To sprinkle with flour.()