Etymology
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zwieback (n.)

1894, from German Zweiback "biscuit," literally "twice-baked," from zwei "two, twice" + backen "to bake;" loan-translation of Italian biscotto (see biscuit).

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Definitions of zwieback

zwieback (n.)
slice of sweet raised bread baked again until it is brown and hard and crisp;
Synonyms: rusk / Brussels biscuit / twice-baked bread
From wordnet.princeton.edu