a twice-baked bread, slices of bread baked until they are hard and crisp (also called a zwieback)
a rectangular, hard, dry biscuit
a cereal binder used in meat product manufacture
a weaning food for children
A usually sweetened bread enriched with eggs that is baked and then sliced and toasted until dry and crisp; considered easy to digest and therefore given to the ill and used as a teething food for toddlers.