"17eg" meaning in Welsh

{
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "adjective"
      },
      "expansion": "17eg",
      "name": "head"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "17th",
          "word": "ail ar bymtheg"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "2003, John Mosedale, Edgar Jones, Welsh Folk Dance Society, Dawnsiau Traddodiadol: Casgliad O Ddawnsfeydd O'r 17eg A'r 18fed Ganrif [Traditional Dances: A Collection of Dances from the 17th and 18th Centuries], Welsh Folk Dance Society:",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Abbreviation of ail ar bymtheg.: 17th"
      ],
      "id": "en-17eg-cy-adj--A8~m-X0",
      "links": [
        [
          "ail ar bymtheg",
          "ail ar bymtheg#Welsh"
        ],
        [
          "17th",
          "17th"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌai̯l ar ˈbəmθɛɡ/"
    }
  ],
  "word": "17eg"
}

{
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "adjective"
      },
      "expansion": "17eg",
      "name": "head"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "17th",
          "word": "ail ar bymtheg"
        }
      ],
      "categories": [
        "Welsh abbreviations",
        "Welsh adjectives",
        "Welsh entries with incorrect language header",
        "Welsh lemmas",
        "Welsh links with redundant alt parameters",
        "Welsh terms spelled with numbers",
        "Welsh terms with IPA pronunciation"
      ],
      "examples": [
        {
          "text": "2003, John Mosedale, Edgar Jones, Welsh Folk Dance Society, Dawnsiau Traddodiadol: Casgliad O Ddawnsfeydd O'r 17eg A'r 18fed Ganrif [Traditional Dances: A Collection of Dances from the 17th and 18th Centuries], Welsh Folk Dance Society:",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Abbreviation of ail ar bymtheg.: 17th"
      ],
      "links": [
        [
          "ail ar bymtheg",
          "ail ar bymtheg#Welsh"
        ],
        [
          "17th",
          "17th"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌai̯l ar ˈbəmθɛɡ/"
    }
  ],
  "word": "17eg"
}