"sea-cow" meaning in English

{
  "forms": [
    {
      "form": "sea-cows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sea-cow (plural sea-cows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sea cow"
        }
      ],
      "categories": [
        {
          "_dis": "62 38",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Alternative spelling of sea cow"
      ],
      "id": "en-sea-cow-en-noun-c1gu3BHr",
      "links": [
        [
          "sea cow",
          "sea cow#English"
        ]
      ],
      "raw_glosses": [
        "(dated) Alternative spelling of sea cow"
      ],
      "tags": [
        "alt-of",
        "alternative",
        "dated"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "South African English",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Hippopotamus."
      ],
      "id": "en-sea-cow-en-noun-jKP9I9vl",
      "links": [
        [
          "Hippopotamus",
          "hippopotamus"
        ]
      ],
      "raw_glosses": [
        "(South Africa, dated) Hippopotamus."
      ],
      "tags": [
        "South-Africa",
        "dated"
      ]
    }
  ],
  "word": "sea-cow"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "sea-cows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sea-cow (plural sea-cows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sea cow"
        }
      ],
      "categories": [
        "English dated terms"
      ],
      "glosses": [
        "Alternative spelling of sea cow"
      ],
      "links": [
        [
          "sea cow",
          "sea cow#English"
        ]
      ],
      "raw_glosses": [
        "(dated) Alternative spelling of sea cow"
      ],
      "tags": [
        "alt-of",
        "alternative",
        "dated"
      ]
    },
    {
      "categories": [
        "English dated terms",
        "South African English"
      ],
      "glosses": [
        "Hippopotamus."
      ],
      "links": [
        [
          "Hippopotamus",
          "hippopotamus"
        ]
      ],
      "raw_glosses": [
        "(South Africa, dated) Hippopotamus."
      ],
      "tags": [
        "South-Africa",
        "dated"
      ]
    }
  ],
  "word": "sea-cow"
}