a powder, which may be either fine or coarse, prepared by sifting and grinding the meal of a grass, esp wheat
2.
any finely powdered substance
—vb
3.
(tr) to make (grain) into flour
4.
(tr) to dredge or sprinkle (food or cooking utensils) with flour
5.
(of mercury) to break into fine particles on the surface of a metal rather than amalgamating, or to produce such an effect on (a metal). The effect is caused by impurities, esp sulphur