Rusk \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.

Source: Webster's Revised Unabridged Dictionary (1913)