"brood cocoon" meaning in English

{
  "forms": [
    {
      "form": "brood cocoons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "brood cocoon (plural brood cocoons)",
      "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": "topical",
          "langcode": "en",
          "name": "Arachnology",
          "orig": "en:Arachnology",
          "parents": [
            "Arthropodology",
            "Zoology",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Biology",
          "orig": "en:Biology",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A cocoon-like structure made of web in which a female spider lays her eggs."
      ],
      "id": "en-brood_cocoon-en-noun-HZjIWYDq",
      "links": [
        [
          "biology",
          "biology"
        ],
        [
          "arachnology",
          "arachnology"
        ],
        [
          "cocoon",
          "cocoon"
        ],
        [
          "web",
          "web"
        ],
        [
          "spider",
          "spider"
        ]
      ],
      "raw_glosses": [
        "(biology, arachnology) A cocoon-like structure made of web in which a female spider lays her eggs."
      ],
      "topics": [
        "arachnology",
        "biology",
        "natural-sciences",
        "zoology"
      ]
    }
  ],
  "word": "brood cocoon"
}

{
  "forms": [
    {
      "form": "brood cocoons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "brood cocoon (plural brood cocoons)",
      "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",
        "en:Arachnology",
        "en:Biology"
      ],
      "glosses": [
        "A cocoon-like structure made of web in which a female spider lays her eggs."
      ],
      "links": [
        [
          "biology",
          "biology"
        ],
        [
          "arachnology",
          "arachnology"
        ],
        [
          "cocoon",
          "cocoon"
        ],
        [
          "web",
          "web"
        ],
        [
          "spider",
          "spider"
        ]
      ],
      "raw_glosses": [
        "(biology, arachnology) A cocoon-like structure made of web in which a female spider lays her eggs."
      ],
      "topics": [
        "arachnology",
        "biology",
        "natural-sciences",
        "zoology"
      ]
    }
  ],
  "word": "brood cocoon"
}