"perspex" meaning in English

{
  "etymology_text": "From the proprietary name Perspex.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "perspex (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English genericized trademarks",
          "parents": [
            "Genericized trademarks",
            "Terms by etymology",
            "Trademarks",
            "Terms by usage"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "New Zealand English",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any tough, transparent plastic that is used instead of glass for windows."
      ],
      "id": "en-perspex-en-noun-DaNNz8xs",
      "links": [
        [
          "plastic",
          "plastic"
        ],
        [
          "glass",
          "glass"
        ],
        [
          "window",
          "window"
        ]
      ],
      "raw_glosses": [
        "(British, New Zealand) Any tough, transparent plastic that is used instead of glass for windows."
      ],
      "tags": [
        "British",
        "New-Zealand",
        "uncountable"
      ]
    }
  ],
  "word": "perspex"
}

{
  "etymology_text": "From the proprietary name Perspex.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "perspex (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English genericized trademarks",
        "English lemmas",
        "English nouns",
        "English uncountable nouns",
        "New Zealand English"
      ],
      "glosses": [
        "Any tough, transparent plastic that is used instead of glass for windows."
      ],
      "links": [
        [
          "plastic",
          "plastic"
        ],
        [
          "glass",
          "glass"
        ],
        [
          "window",
          "window"
        ]
      ],
      "raw_glosses": [
        "(British, New Zealand) Any tough, transparent plastic that is used instead of glass for windows."
      ],
      "tags": [
        "British",
        "New-Zealand",
        "uncountable"
      ]
    }
  ],
  "word": "perspex"
}