"opalescent nudibranch" meaning in English

{
  "forms": [
    {
      "form": "opalescent nudibranchs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "opalescent nudibranch (plural opalescent nudibranchs)",
      "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",
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          "source": "w"
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          "source": "w"
        },
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          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Nudibranchs",
          "orig": "en:Nudibranchs",
          "parents": [
            "Gastropods",
            "Mollusks",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
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          "source": "w"
        }
      ],
      "glosses": [
        "A brightly-coloured nudibranch sea slug, Hermissenda crassicornis, with an orange stripe along its head area as well as white stripes on the cerata and those running down the mantle."
      ],
      "id": "en-opalescent_nudibranch-en-noun-9QqkV57Q",
      "links": [
        [
          "nudibranch",
          "nudibranch"
        ],
        [
          "sea slug",
          "sea slug"
        ],
        [
          "orange",
          "orange"
        ],
        [
          "white",
          "white"
        ],
        [
          "cerata",
          "cerata"
        ],
        [
          "mantle",
          "mantle"
        ]
      ],
      "synonyms": [
        {
          "word": "thick-horned nudibranch"
        }
      ]
    }
  ],
  "word": "opalescent nudibranch"
}

{
  "forms": [
    {
      "form": "opalescent nudibranchs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s"
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      "expansion": "opalescent nudibranch (plural opalescent nudibranchs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
      "categories": [
        "English countable nouns",
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        "en:Nudibranchs"
      ],
      "glosses": [
        "A brightly-coloured nudibranch sea slug, Hermissenda crassicornis, with an orange stripe along its head area as well as white stripes on the cerata and those running down the mantle."
      ],
      "links": [
        [
          "nudibranch",
          "nudibranch"
        ],
        [
          "sea slug",
          "sea slug"
        ],
        [
          "orange",
          "orange"
        ],
        [
          "white",
          "white"
        ],
        [
          "cerata",
          "cerata"
        ],
        [
          "mantle",
          "mantle"
        ]
      ],
      "synonyms": [
        {
          "word": "thick-horned nudibranch"
        }
      ]
    }
  ],
  "word": "opalescent nudibranch"
}