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.
© Webster 1913.