"troy weight" meaning in English

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  "lang_code": "en",
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          "name": "Units of measure",
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      "glosses": [
        "A system of units of weight/mass, mostly used for precious metals and gemstones, in which the pound contains 12 ounces which each contain 480 grains."
      ],
      "id": "en-troy_weight-en-noun-3elm2dXn",
      "links": [
        [
          "system",
          "system"
        ],
        [
          "unit",
          "unit"
        ],
        [
          "mass",
          "mass"
        ],
        [
          "precious",
          "precious"
        ],
        [
          "metal",
          "metal"
        ],
        [
          "gemstone",
          "gemstone"
        ],
        [
          "pound",
          "pound"
        ],
        [
          "ounce",
          "ounce"
        ],
        [
          "grain",
          "grain"
        ]
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "jīnhéng",
          "sense": "system of units",
          "word": "金衡"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "system of units",
          "word": "troy-painomittajärjestelmä"
        },
        {
          "code": "ga",
          "lang": "Irish",
          "sense": "system of units",
          "tags": [
            "masculine"
          ],
          "word": "meáchan troí"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "trójskij ves",
          "sense": "system of units",
          "tags": [
            "masculine"
          ],
          "word": "тро́йский вес"
        }
      ],
      "wikipedia": [
        "troy weight"
      ]
    }
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  "word": "troy weight"
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  "lang_code": "en",
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        "A system of units of weight/mass, mostly used for precious metals and gemstones, in which the pound contains 12 ounces which each contain 480 grains."
      ],
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        [
          "system",
          "system"
        ],
        [
          "unit",
          "unit"
        ],
        [
          "mass",
          "mass"
        ],
        [
          "precious",
          "precious"
        ],
        [
          "metal",
          "metal"
        ],
        [
          "gemstone",
          "gemstone"
        ],
        [
          "pound",
          "pound"
        ],
        [
          "ounce",
          "ounce"
        ],
        [
          "grain",
          "grain"
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      "wikipedia": [
        "troy weight"
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  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "jīnhéng",
      "sense": "system of units",
      "word": "金衡"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "system of units",
      "word": "troy-painomittajärjestelmä"
    },
    {
      "code": "ga",
      "lang": "Irish",
      "sense": "system of units",
      "tags": [
        "masculine"
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      "word": "meáchan troí"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "trójskij ves",
      "sense": "system of units",
      "tags": [
        "masculine"
      ],
      "word": "тро́йский вес"
    }
  ],
  "word": "troy weight"
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