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Noun: zwieback  'zwee,bak or 'zwI,bak
Usage: N. Amer
  1. Slice of sweet raised bread baked again until it is brown and hard and crisp
    "Zwieback is often given to teething babies";
    - rusk, Brussels biscuit, twice-baked bread

Derived forms: zwiebacks

Type of: toast

Encyclopedia: Zwieback