"wythdeg" meaning in Welsh

{
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "numeral"
      },
      "expansion": "wythdeg",
      "name": "head"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "num",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "eighty",
          "word": "wyth deg"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Welsh cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Nonstandard spelling of wyth deg (“eighty”)."
      ],
      "id": "en-wythdeg-cy-num-WyAyAmCQ",
      "links": [
        [
          "cardinal number",
          "cardinal number"
        ],
        [
          "wyth deg",
          "wyth deg#Welsh"
        ]
      ],
      "raw_glosses": [
        "(cardinal number) Nonstandard spelling of wyth deg (“eighty”)."
      ],
      "tags": [
        "alt-of",
        "cardinal",
        "nonstandard",
        "numeral"
      ]
    }
  ],
  "word": "wythdeg"
}

{
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "numeral"
      },
      "expansion": "wythdeg",
      "name": "head"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "num",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "eighty",
          "word": "wyth deg"
        }
      ],
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Welsh cardinal numbers",
        "Welsh entries with incorrect language header",
        "Welsh lemmas",
        "Welsh nonstandard forms",
        "Welsh numerals"
      ],
      "glosses": [
        "Nonstandard spelling of wyth deg (“eighty”)."
      ],
      "links": [
        [
          "cardinal number",
          "cardinal number"
        ],
        [
          "wyth deg",
          "wyth deg#Welsh"
        ]
      ],
      "raw_glosses": [
        "(cardinal number) Nonstandard spelling of wyth deg (“eighty”)."
      ],
      "tags": [
        "alt-of",
        "cardinal",
        "nonstandard",
        "numeral"
      ]
    }
  ],
  "word": "wythdeg"
}