"Alexandrine rat" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "NL.",
        "3": "rattus alexandrīnus",
        "nocap": "1"
      },
      "expansion": "calque of New Latin rattus alexandrīnus",
      "name": "calque"
    }
  ],
  "etymology_text": "From its original habitat; a calque of New Latin rattus alexandrīnus.",
  "forms": [
    {
      "form": "Alexandrine rats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Alexandrine rat (plural Alexandrine rats)",
      "name": "en-noun"
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  ],
  "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"
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          "source": "w"
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          "source": "w"
        },
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          "source": "w"
        }
      ],
      "glosses": [
        "A certain color morph of the black rat, once regarded as a distinct subspecies."
      ],
      "id": "en-Alexandrine_rat-en-noun-9HSkSKm-",
      "links": [
        [
          "black rat",
          "black rat"
        ],
        [
          "subspecies",
          "subspecies"
        ]
      ]
    }
  ],
  "word": "Alexandrine rat"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "NL.",
        "3": "rattus alexandrīnus",
        "nocap": "1"
      },
      "expansion": "calque of New Latin rattus alexandrīnus",
      "name": "calque"
    }
  ],
  "etymology_text": "From its original habitat; a calque of New Latin rattus alexandrīnus.",
  "forms": [
    {
      "form": "Alexandrine rats",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Alexandrine rat (plural Alexandrine rats)",
      "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 calqued from New Latin",
        "English terms derived from New Latin",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A certain color morph of the black rat, once regarded as a distinct subspecies."
      ],
      "links": [
        [
          "black rat",
          "black rat"
        ],
        [
          "subspecies",
          "subspecies"
        ]
      ]
    }
  ],
  "word": "Alexandrine rat"
}