"怪獣" meaning in Japanese

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "kaiju"
          },
          "expansion": "English: kaiju",
          "name": "desc"
        },
        {
          "args": {
            "1": "from 大怪獣"
          },
          "expansion": "(from 大怪獣)",
          "name": "gloss"
        }
      ],
      "text": "English: kaiju (from 大怪獣)"
    }
  ],
  "forms": [
    {
      "form": "怪獣",
      "ruby": [
        [
          "怪",
          "かい"
        ],
        [
          "獣",
          "じゅう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kaijū",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kwaiziu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "くわいじう",
      "roman": "kwaiziu",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "かいじゅう",
        "hhira": "くわいじう"
      },
      "expansion": "怪(かい)獣(じゅう) • (kaijū) ^(←くわいじう (kwaiziu)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 2 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "roman": "daikaijū",
          "word": "大怪獣"
        },
        {
          "roman": "daikaijū eiga",
          "word": "大怪獣映画"
        },
        {
          "roman": "kaijū eiga",
          "word": "怪獣映画"
        }
      ],
      "glosses": [
        "monster"
      ],
      "id": "en-怪獣-ja-noun-vqr6UQvM",
      "links": [
        [
          "monster",
          "monster"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ka̠iʑɨː]"
    }
  ],
  "word": "怪獣"
}

{
  "derived": [
    {
      "roman": "daikaijū",
      "word": "大怪獣"
    },
    {
      "roman": "daikaijū eiga",
      "word": "大怪獣映画"
    },
    {
      "roman": "kaijū eiga",
      "word": "怪獣映画"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "en",
            "2": "kaiju"
          },
          "expansion": "English: kaiju",
          "name": "desc"
        },
        {
          "args": {
            "1": "from 大怪獣"
          },
          "expansion": "(from 大怪獣)",
          "name": "gloss"
        }
      ],
      "text": "English: kaiju (from 大怪獣)"
    }
  ],
  "forms": [
    {
      "form": "怪獣",
      "ruby": [
        [
          "怪",
          "かい"
        ],
        [
          "獣",
          "じゅう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kaijū",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kwaiziu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "くわいじう",
      "roman": "kwaiziu",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "かいじゅう",
        "hhira": "くわいじう"
      },
      "expansion": "怪(かい)獣(じゅう) • (kaijū) ^(←くわいじう (kwaiziu)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms historically spelled with わ",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with 2 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with IPA pronunciation missing pitch accent",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "monster"
      ],
      "links": [
        [
          "monster",
          "monster"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ka̠iʑɨː]"
    }
  ],
  "word": "怪獣"
}

{
  "called_from": "parser/304",
  "msg": "HTML tag <span> not properly closed",
  "path": [
    "怪獣"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "怪獣",
  "trace": "started on line 2, detected on line 2"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "怪獣"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "怪獣",
  "trace": ""
}