\Rusk\, n. [Sp. rosca de mar sea rusks, a kind of biscuit,
rosca properly meaning, a screw, spiral.]
1. A kind of light, soft bread made with yeast and eggs,
   often toasted or crisped in an oven; or, a kind of
   sweetened biscuit.
2. A kind of light, hard cake or bread, as for stores.
   --Smart.
3. Bread or cake which has been made brown and crisp, and
   afterwards grated, or pulverized in a mortar.