zwiebacks

Noun

zwieback (countable and uncountable, plural zwiebacks)

1. A form of rusk, 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.
   • Ogden Nash, Adventures Of Isabel
     She nibbled the zwieback that she always fed off,
     And when it was gone, she cut the giant's head off.