"lead glass" meaning in English

{
  "forms": [
    {
      "form": "lead glasses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "lead glass (usually uncountable, plural lead glasses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "parents": [
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          "source": "w"
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          "kind": "other",
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          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Lead",
          "orig": "en:Lead",
          "parents": [
            "Carbon group elements",
            "Chemical elements",
            "Matter",
            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wikipedia with redundant first parameter",
          "orig": "wikipedia with redundant first parameter",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Coordinate term: uranium glass"
        }
      ],
      "glosses": [
        "Glass containing lead oxide, used for its high refractive index (often in cut glass) or for its ability to block ionizing radiation."
      ],
      "id": "en-lead_glass-en-noun-lulY83cw",
      "links": [
        [
          "Glass",
          "glass"
        ],
        [
          "lead oxide",
          "lead oxide"
        ],
        [
          "refractive index",
          "refractive index"
        ],
        [
          "cut glass",
          "cut glass"
        ],
        [
          "ionizing radiation",
          "ionizing radiation"
        ]
      ],
      "synonyms": [
        {
          "word": "lead crystal"
        }
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "word": "lead glass"
}

{
  "forms": [
    {
      "form": "lead glasses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "+"
      },
      "expansion": "lead glass (usually uncountable, plural lead glasses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Lead",
        "wikipedia with redundant first parameter"
      ],
      "examples": [
        {
          "text": "Coordinate term: uranium glass"
        }
      ],
      "glosses": [
        "Glass containing lead oxide, used for its high refractive index (often in cut glass) or for its ability to block ionizing radiation."
      ],
      "links": [
        [
          "Glass",
          "glass"
        ],
        [
          "lead oxide",
          "lead oxide"
        ],
        [
          "refractive index",
          "refractive index"
        ],
        [
          "cut glass",
          "cut glass"
        ],
        [
          "ionizing radiation",
          "ionizing radiation"
        ]
      ],
      "synonyms": [
        {
          "word": "lead crystal"
        }
      ],
      "tags": [
        "uncountable",
        "usually"
      ]
    }
  ],
  "word": "lead glass"
}