From WordNet (r) 2.0 (August 2003) [wn]:
flour
n : fine powdery foodstuff obtained by grinding and sifting the
meal of a cereal grain
v 1: cover with flour; "flour fish or meat before frying it"
2: convert grain into flour
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flour \Flour\ (flour), n. [F. fleur de farine the flower (i.e.,
the best) of meal, cf. Sp. flor de la harina superfine flour,
Icel. fl["u]r 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.
[1913 Webster]
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.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]