"greyboard" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grey",
        "3": "board"
      },
      "expansion": "grey + board",
      "name": "compound"
    }
  ],
  "etymology_text": "From grey + board.",
  "forms": [
    {
      "form": "grayboard",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "greyboard (uncountable)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Thick grey paper used either as packaging or for artwork."
      ],
      "id": "en-greyboard-en-noun-JPFc6WRk",
      "links": [
        [
          "grey",
          "grey"
        ],
        [
          "paper",
          "paper"
        ],
        [
          "packaging",
          "packaging"
        ],
        [
          "artwork",
          "artwork"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "greyboard"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grey",
        "3": "board"
      },
      "expansion": "grey + board",
      "name": "compound"
    }
  ],
  "etymology_text": "From grey + board.",
  "forms": [
    {
      "form": "grayboard",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "greyboard (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Thick grey paper used either as packaging or for artwork."
      ],
      "links": [
        [
          "grey",
          "grey"
        ],
        [
          "paper",
          "paper"
        ],
        [
          "packaging",
          "packaging"
        ],
        [
          "artwork",
          "artwork"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "greyboard"
}