"shadow mask" meaning in English

{
  "forms": [
    {
      "form": "shadow masks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shadow mask (plural shadow masks)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Television",
          "orig": "en:Television",
          "parents": [
            "Broadcasting",
            "Mass media",
            "Media",
            "Telecommunications",
            "Culture",
            "Communication",
            "Technology",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A plate punched with tiny holes that separate the coloured phosphors in the layer behind the front glass of the screen. Three electron guns at the back of the screen sweep across the mask, with the beams only reaching the screen if they pass through the holes."
      ],
      "id": "en-shadow_mask-en-noun-grRA6H49",
      "links": [
        [
          "television",
          "television"
        ],
        [
          "phosphor",
          "phosphor"
        ]
      ],
      "raw_glosses": [
        "(television) A plate punched with tiny holes that separate the coloured phosphors in the layer behind the front glass of the screen. Three electron guns at the back of the screen sweep across the mask, with the beams only reaching the screen if they pass through the holes."
      ],
      "topics": [
        "broadcasting",
        "media",
        "television"
      ],
      "wikipedia": [
        "shadow mask"
      ]
    }
  ],
  "word": "shadow mask"
}

{
  "forms": [
    {
      "form": "shadow masks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shadow mask (plural shadow masks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Television"
      ],
      "glosses": [
        "A plate punched with tiny holes that separate the coloured phosphors in the layer behind the front glass of the screen. Three electron guns at the back of the screen sweep across the mask, with the beams only reaching the screen if they pass through the holes."
      ],
      "links": [
        [
          "television",
          "television"
        ],
        [
          "phosphor",
          "phosphor"
        ]
      ],
      "raw_glosses": [
        "(television) A plate punched with tiny holes that separate the coloured phosphors in the layer behind the front glass of the screen. Three electron guns at the back of the screen sweep across the mask, with the beams only reaching the screen if they pass through the holes."
      ],
      "topics": [
        "broadcasting",
        "media",
        "television"
      ],
      "wikipedia": [
        "shadow mask"
      ]
    }
  ],
  "word": "shadow mask"
}