"sea bread" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Food and drink",
          "orig": "en:Food and drink",
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      "examples": [
        {
          "ref": "1933, Felix Riesenberg, Mother Sea, page 31:",
          "text": "He missed his eggs and bacon, and his teeth were not too good for the grinding of hard sea bread. \"Have some bread, Mr. Casy. This tack seems prime to me, not a worm, mind you, and that coffee's been around the Horn, if it is coffee. […]",
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      "glosses": [
        "Synonym of hardtack"
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        "(archaic) Synonym of hardtack"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Food and drink"
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          "ref": "1933, Felix Riesenberg, Mother Sea, page 31:",
          "text": "He missed his eggs and bacon, and his teeth were not too good for the grinding of hard sea bread. \"Have some bread, Mr. Casy. This tack seems prime to me, not a worm, mind you, and that coffee's been around the Horn, if it is coffee. […]",
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        "Synonym of hardtack"
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        "(archaic) Synonym of hardtack"
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