The Collaborative International Dictionary of English v.0.48:

Dredge \Dredge\, v. t.
   To sift or sprinkle flour, etc., on, as on roasting meat.
   --Beau. & Fl.
   [1913 Webster]

   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.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dredger \Dredg"er\, n. (Cookery)
   A box with holes in its lid; -- used for sprinkling flour, as
   on meat or a breadboard; -- called also dredging box,
   drudger, and drudging box.
   [1913 Webster]