"petra" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "petra",
        "4": "",
        "5": "rock"
      },
      "expansion": "Latin petra (“rock”)",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "piedra"
      },
      "expansion": "Doublet of piedra",
      "name": "doublet"
    }
  ],
  "etymology_text": "From Latin petra (“rock”). Doublet of piedra.",
  "head_templates": [
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      "args": {
        "1": "?"
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      "expansion": "petra",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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      "examples": [
        {
          "ref": "1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 209:",
          "text": "Generally, however, the stone or petra, almost always of 14 lbs., is used, the tod of 28 lbs., and the sack of thirteen stone.",
          "type": "quote"
        }
      ],
      "glosses": [
        "stone, a weight equal to 14 pounds."
      ],
      "id": "en-petra-en-noun-JoB6N2f8",
      "links": [
        [
          "stone",
          "stone"
        ],
        [
          "weight",
          "weight"
        ],
        [
          "pound",
          "pound"
        ]
      ]
    }
  ],
  "word": "petra"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "petra",
        "4": "",
        "5": "rock"
      },
      "expansion": "Latin petra (“rock”)",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "piedra"
      },
      "expansion": "Doublet of piedra",
      "name": "doublet"
    }
  ],
  "etymology_text": "From Latin petra (“rock”). Doublet of piedra.",
  "head_templates": [
    {
      "args": {
        "1": "?"
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      "expansion": "petra",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English doublets",
        "English entries with incorrect language header",
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        {
          "ref": "1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 209:",
          "text": "Generally, however, the stone or petra, almost always of 14 lbs., is used, the tod of 28 lbs., and the sack of thirteen stone.",
          "type": "quote"
        }
      ],
      "glosses": [
        "stone, a weight equal to 14 pounds."
      ],
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          "stone",
          "stone"
        ],
        [
          "weight",
          "weight"
        ],
        [
          "pound",
          "pound"
        ]
      ]
    }
  ],
  "word": "petra"
}