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Noun hardtack has 2 senses
  1. hardtack, pilot biscuit, pilot bread, sea biscuit, ship biscuit - very hard unsalted biscuit or bread; a former ship's staple
    --1 is a kind of biscuit
  2. hardtack - a mountain mahogany
    --2 is a kind of     mahogany, mahogany tree
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