zwieback means 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. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
Etymology
From German Zwieback, from zwie- (“twi-, two-”) + backen (“to bake”) (i.e. “twice-baked”), a calque of Italian biscotto (but not to be confused with it).
noun
- 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.”