"roan duck" meaning in English

{
  "forms": [
    {
      "form": "roan ducks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "roan duck (plural roan ducks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Dabbling ducks",
          "orig": "en:Dabbling ducks",
          "parents": [
            "Ducks",
            "Anatids",
            "Poultry",
            "Freshwater birds",
            "Birds",
            "Livestock",
            "Vertebrates",
            "Agriculture",
            "Animals",
            "Chordates",
            "Applied sciences",
            "Lifeforms",
            "Sciences",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A Rouen duck, a breed of domestic duck."
      ],
      "id": "en-roan_duck-en-noun-u2o7iDPj",
      "links": [
        [
          "Rouen",
          "Rouen"
        ],
        [
          "duck",
          "duck"
        ],
        [
          "breed",
          "breed"
        ],
        [
          "domestic duck",
          "domestic duck"
        ]
      ],
      "raw_glosses": [
        "(obsolete) A Rouen duck, a breed of domestic duck."
      ],
      "tags": [
        "obsolete"
      ]
    }
  ],
  "word": "roan duck"
}

{
  "forms": [
    {
      "form": "roan ducks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "roan duck (plural roan ducks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with obsolete senses",
        "en:Dabbling ducks"
      ],
      "glosses": [
        "A Rouen duck, a breed of domestic duck."
      ],
      "links": [
        [
          "Rouen",
          "Rouen"
        ],
        [
          "duck",
          "duck"
        ],
        [
          "breed",
          "breed"
        ],
        [
          "domestic duck",
          "domestic duck"
        ]
      ],
      "raw_glosses": [
        "(obsolete) A Rouen duck, a breed of domestic duck."
      ],
      "tags": [
        "obsolete"
      ]
    }
  ],
  "word": "roan duck"
}