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]

The Collaborative International Dictionary of English v.0.48:

Drudging box \Drudg"ing box`\
   See Dredging box.
   [1913 Webster]