Source : Webster's Revised Unabridged Dictionary (1913)

Dredge \Dredge\, v. t.
   To sift or sprinkle flour, etc., on, as on roasting meat.
   --Beau. & Fl.

   {Dredging box}.
   (a) Same as 2d {Dredger}.
   (b) (Gun.) A copper box with a perforated lid; -- used for
       sprinkling meal powder over shell fuses. --Farrow.