rusk

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A light, soft-textured sweetened biscuit.
• noun Sweet raised bread dried and browned in an oven.

from The Century Dictionary.

• noun A kind of light, hard cake or bread, as for ships' stores.
• noun Bread or cake dried and browned in the oven, and reduced to crumbs by pounding, the crumbs being usually eaten with milk.
• noun A kind of light cake; a kind of soft, sweetened biscuit.
• To make rusk of; convert, as bread or cake, into rusk. See rusk, n.

from the GNU version of the Collaborative International Dictionary of English.

• noun A kind of light, soft bread made with yeast and eggs, often toasted or crisped in an oven; or, a kind of sweetened biscuit.
• noun A kind of light, hard cake or bread, as for stores.
• noun Bread or cake which has been made brown and crisp, and afterwards grated, or pulverized in a mortar.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a rectangular, hard, dry biscuit
• noun a twice-baked bread, slices of bread baked until they are hard and crisp (also called a zwieback)
• noun a weening food for children
• noun a cereal binder used in meat product manufacture

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun slice of sweet raised bread baked again until it is brown and hard and crisp