Real Dictionary

flour
variable noun: Flour is a white or brown powder that is made by grinding grain. It is used to make bread, cakes, and pastry.
verb: If you flour cooking equipment or food, you cover it with flour.

flour in American English
a fine, powdery substance, or meal, produced by grinding and sifting grain, esp. wheat, or any of various edible roots, nuts, etc.
to put flour in or on
intransitive verb: to refuse to amalgamate with another metal because of some impurity of the metal; lie on the surface of the metal in the form of minute globules
noun: the finely ground meal of grain, esp. the finer meal separated by bolting
transitive verb: to make (grain or the like) into flour; grind and bolt

flour in British English
noun: a powder, which may be either fine or coarse, prepared by sifting and grinding the meal of a grass, esp wheat
verb: to make (grain) into flour