"neidr ddu" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "neidr",
        "3": "",
        "4": "snake"
      },
      "expansion": "neidr (“snake”)",
      "name": "l"
    },
    {
      "args": {
        "1": "cy",
        "2": "du",
        "3": "",
        "4": "black"
      },
      "expansion": "du (“black”)",
      "name": "l"
    }
  ],
  "etymology_text": "From neidr (“snake”) and du (“black”).",
  "forms": [
    {
      "form": "nadroedd duon",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "nadredd duon",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cy-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "neidr ddu",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "nadroedd duon",
        "pl2": "nadredd duon"
      },
      "expansion": "neidr ddu f (plural nadroedd duon or nadredd duon, not mutable)",
      "name": "cy-noun"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "cy-mut"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "cy",
          "name": "Reptiles",
          "orig": "cy:Reptiles",
          "parents": [
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "adder"
      ],
      "id": "en-neidr_ddu-cy-noun-t6LQ-czw",
      "links": [
        [
          "adder",
          "adder"
        ]
      ],
      "synonyms": [
        {
          "word": "gwiber"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌnei̯dr ˈðɨː/",
      "note": "cy"
    },
    {
      "ipa": "/ˌnei̯dɪr ˈðɨː/",
      "tags": [
        "South-Wales"
      ]
    },
    {
      "ipa": "/ˌnei̯dɪr ˈðiː/",
      "tags": [
        "South-Wales"
      ]
    }
  ],
  "word": "neidr ddu"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "neidr",
        "3": "",
        "4": "snake"
      },
      "expansion": "neidr (“snake”)",
      "name": "l"
    },
    {
      "args": {
        "1": "cy",
        "2": "du",
        "3": "",
        "4": "black"
      },
      "expansion": "du (“black”)",
      "name": "l"
    }
  ],
  "etymology_text": "From neidr (“snake”) and du (“black”).",
  "forms": [
    {
      "form": "nadroedd duon",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "nadredd duon",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cy-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "neidr ddu",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "nadroedd duon",
        "pl2": "nadredd duon"
      },
      "expansion": "neidr ddu f (plural nadroedd duon or nadredd duon, not mutable)",
      "name": "cy-noun"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "cy-mut"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "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",
        "Welsh terms with IPA pronunciation",
        "cy:Reptiles"
      ],
      "glosses": [
        "adder"
      ],
      "links": [
        [
          "adder",
          "adder"
        ]
      ],
      "synonyms": [
        {
          "word": "gwiber"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌnei̯dr ˈðɨː/",
      "note": "cy"
    },
    {
      "ipa": "/ˌnei̯dɪr ˈðɨː/",
      "tags": [
        "South-Wales"
      ]
    },
    {
      "ipa": "/ˌnei̯dɪr ˈðiː/",
      "tags": [
        "South-Wales"
      ]
    }
  ],
  "word": "neidr ddu"
}