"θαλάσσιος ίππος" meaning in Grieks

{
  "categories": [
    {
      "kind": "other",
      "name": "Woorden in het Grieks",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Zelfstandig naamwoord in het Grieks",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Grieks",
  "lang_code": "el",
  "pos": "noun",
  "pos_title": "Zelfstandig naamwoord",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Roofdieren_in_het_Grieks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Zoogdieren in het Grieks",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "walrus"
      ],
      "id": "nl-θαλάσσιος_ίππος-el-noun-lnEBRkXO",
      "raw_tags": [
        "roofdieren"
      ]
    }
  ],
  "word": "θαλάσσιος ίππος"
}

{
  "categories": [
    "Woorden in het Grieks",
    "Zelfstandig naamwoord in het Grieks"
  ],
  "lang": "Grieks",
  "lang_code": "el",
  "pos": "noun",
  "pos_title": "Zelfstandig naamwoord",
  "senses": [
    {
      "categories": [
        "Roofdieren_in_het_Grieks",
        "Zoogdieren in het Grieks"
      ],
      "glosses": [
        "walrus"
      ],
      "raw_tags": [
        "roofdieren"
      ]
    }
  ],
  "word": "θαλάσσιος ίππος"
}