"hardground" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "hard",
        "3": "ground"
      },
      "expansion": "hard + ground",
      "name": "compound"
    }
  ],
  "etymology_text": "From hard + ground.",
  "forms": [
    {
      "form": "hardgrounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hardground (plural hardgrounds)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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      ],
      "examples": [
        {
          "text": "Ancient hardgrounds are found in limestone sequences and distinguished from later-lithified sediments by evidence of exposure to normal marine waters.",
          "type": "example"
        }
      ],
      "glosses": [
        "A lithified seafloor."
      ],
      "id": "en-hardground-en-noun-Ac1o2v2O",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "lithified",
          "lithify"
        ],
        [
          "seafloor",
          "seafloor"
        ]
      ],
      "raw_glosses": [
        "(geology) A lithified seafloor."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mining",
          "orig": "en:Mining",
          "parents": [
            "Industries",
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A hard stratum of rock other than coal."
      ],
      "id": "en-hardground-en-noun-lDlLK4MZ",
      "links": [
        [
          "mining",
          "mining#Noun"
        ],
        [
          "stratum",
          "stratum"
        ],
        [
          "rock",
          "rock"
        ],
        [
          "coal",
          "coal"
        ]
      ],
      "raw_glosses": [
        "(mining) A hard stratum of rock other than coal."
      ],
      "topics": [
        "business",
        "mining"
      ]
    }
  ],
  "wikipedia": [
    "hardground"
  ],
  "word": "hardground"
}

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  "etymology_templates": [
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        "2": "hard",
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      "expansion": "hard + ground",
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    }
  ],
  "etymology_text": "From hard + ground.",
  "forms": [
    {
      "form": "hardgrounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with usage examples",
        "en:Geology"
      ],
      "examples": [
        {
          "text": "Ancient hardgrounds are found in limestone sequences and distinguished from later-lithified sediments by evidence of exposure to normal marine waters.",
          "type": "example"
        }
      ],
      "glosses": [
        "A lithified seafloor."
      ],
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        ],
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        ],
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          "seafloor",
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        ]
      ],
      "raw_glosses": [
        "(geology) A lithified seafloor."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    },
    {
      "categories": [
        "en:Mining"
      ],
      "glosses": [
        "A hard stratum of rock other than coal."
      ],
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        ],
        [
          "stratum",
          "stratum"
        ],
        [
          "rock",
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        ],
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          "coal",
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        "(mining) A hard stratum of rock other than coal."
      ],
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        "business",
        "mining"
      ]
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  ],
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    "hardground"
  ],
  "word": "hardground"
}