"heol ddwbl" meaning in Welsh

{
  "forms": [
    {
      "form": "heolydd dwbl",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "heolydd dwbl",
        "head": "heol ddwbl"
      },
      "expansion": "heol ddwbl f (plural heolydd dwbl, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cy",
          "name": "Roads",
          "orig": "cy:Roads",
          "parents": [
            "Road transport",
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "dual carriageway, divided highway"
      ],
      "id": "en-heol_ddwbl-cy-noun-bHJRt6DV",
      "links": [
        [
          "dual carriageway",
          "dual carriageway"
        ],
        [
          "divided highway",
          "divided highway"
        ]
      ],
      "synonyms": [
        {
          "word": "heol ddeuol"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "word": "heol ddwbl"
}

{
  "forms": [
    {
      "form": "heolydd dwbl",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "heolydd dwbl",
        "head": "heol ddwbl"
      },
      "expansion": "heol ddwbl f (plural heolydd dwbl, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Welsh countable nouns",
        "Welsh entries with incorrect language header",
        "Welsh feminine nouns",
        "Welsh lemmas",
        "Welsh multiword terms",
        "Welsh non-mutable terms",
        "Welsh nouns",
        "Welsh nouns with red links in their headword lines",
        "cy:Roads"
      ],
      "glosses": [
        "dual carriageway, divided highway"
      ],
      "links": [
        [
          "dual carriageway",
          "dual carriageway"
        ],
        [
          "divided highway",
          "divided highway"
        ]
      ],
      "synonyms": [
        {
          "word": "heol ddeuol"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "word": "heol ddwbl"
}