"15ed" meaning in Welsh

{
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "adjective"
      },
      "expansion": "15ed",
      "name": "head"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "15fed"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "On the 15th of April, the same year, he placed two live frogs in a bucket of soil, which he covered with glass, so that he could observe them frequently.",
          "ref": "1859, Rhyfeddodau natur a chelfyddyd, sef, cyfeithiadau gan mwyaf, o weithoedd y prif awduron Seisonig, Bethesda: R. Jones, page 116",
          "text": "Ar y 15ed o Ebrill, yr un flwyddyn, gosododd ddau lyffant byw mewn cawg o gynrwd, yr hwn a orchuddiai â gwydr, fel y gallai sylwi arnynt yn fynych.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Nonstandard spelling of 15fed."
      ],
      "id": "en-15ed-cy-adj-BqRiPJzt",
      "links": [
        [
          "15fed",
          "15fed#Welsh"
        ]
      ],
      "tags": [
        "alt-of",
        "nonstandard"
      ]
    }
  ],
  "word": "15ed"
}

{
  "head_templates": [
    {
      "args": {
        "1": "cy",
        "2": "adjective"
      },
      "expansion": "15ed",
      "name": "head"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "15fed"
        }
      ],
      "categories": [
        "Welsh adjectives",
        "Welsh entries with incorrect language header",
        "Welsh lemmas",
        "Welsh nonstandard forms",
        "Welsh terms spelled with numbers",
        "Welsh terms with quotations"
      ],
      "examples": [
        {
          "english": "On the 15th of April, the same year, he placed two live frogs in a bucket of soil, which he covered with glass, so that he could observe them frequently.",
          "ref": "1859, Rhyfeddodau natur a chelfyddyd, sef, cyfeithiadau gan mwyaf, o weithoedd y prif awduron Seisonig, Bethesda: R. Jones, page 116",
          "text": "Ar y 15ed o Ebrill, yr un flwyddyn, gosododd ddau lyffant byw mewn cawg o gynrwd, yr hwn a orchuddiai â gwydr, fel y gallai sylwi arnynt yn fynych.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Nonstandard spelling of 15fed."
      ],
      "links": [
        [
          "15fed",
          "15fed#Welsh"
        ]
      ],
      "tags": [
        "alt-of",
        "nonstandard"
      ]
    }
  ],
  "word": "15ed"
}