"sea hedgehog" meaning in English

{
  "forms": [
    {
      "form": "sea hedgehogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sea hedgehog (plural sea hedgehogs)",
      "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": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Sea urchins",
          "orig": "en:Sea urchins",
          "parents": [
            "Echinoderms",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "sea urchin"
      ],
      "id": "en-sea_hedgehog-en-noun-sfPtAvcc",
      "links": [
        [
          "sea urchin",
          "sea urchin"
        ]
      ],
      "raw_glosses": [
        "(archaic) sea urchin"
      ],
      "tags": [
        "archaic"
      ]
    }
  ],
  "word": "sea hedgehog"
}

{
  "forms": [
    {
      "form": "sea hedgehogs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sea hedgehog (plural sea hedgehogs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with archaic senses",
        "English terms with non-redundant non-automated sortkeys",
        "en:Sea urchins"
      ],
      "glosses": [
        "sea urchin"
      ],
      "links": [
        [
          "sea urchin",
          "sea urchin"
        ]
      ],
      "raw_glosses": [
        "(archaic) sea urchin"
      ],
      "tags": [
        "archaic"
      ]
    }
  ],
  "word": "sea hedgehog"
}