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Hardtack is a type of hard biscuit, bread, or cracker that is saltless. It is also known by other names, including pilot biscuit or pilot bread, and ship biscuit or ship bread. The term "tack" can also refer to hardtack. This food item has been in use since at least 1634.1234

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4 Britannica Sources
  1. hardtack
  2. pilot biscuit
  3. ship biscuit
  4. tack

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