hardtack

Noun
  1. Very hard unsalted biscuit or bread;
    A former ship's staple (synset 107710584)
    is a type of: biscuit - small round bread leavened with baking-powder or soda
    same as: pilot biscuit, pilot bread, sea biscuit, ship biscuit
  2. A mountain mahogany (synset 115125137)
    is a type of: mahogany, mahogany tree - any of various tropical timber trees of the family Meliaceae especially the genus Swietinia valued for their hard yellowish- to reddish-brown wood that is readily worked and takes a high polish

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