"tyrannosaurus rex" meaning in English

{
  "forms": [
    {
      "form": "tyrannosaurus rex",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "tyrannosaurus rexes",
      "tags": [
        "plural"
      ]
    }
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      "expansion": "tyrannosaurus rex (countable and uncountable, plural tyrannosaurus rex or tyrannosaurus rexes)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "alt_of": [
        {
          "word": "Tyrannosaurus rex"
        }
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          "source": "w"
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      ],
      "glosses": [
        "Alternative letter-case form of Tyrannosaurus rex"
      ],
      "id": "en-tyrannosaurus_rex-en-noun-ldVOCbVH",
      "links": [
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          "Tyrannosaurus rex#English"
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    }
  ],
  "word": "tyrannosaurus rex"
}

{
  "forms": [
    {
      "form": "tyrannosaurus rex",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "tyrannosaurus rexes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Tyrannosaurus rex"
        }
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        "English uncountable nouns",
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      "glosses": [
        "Alternative letter-case form of Tyrannosaurus rex"
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  "word": "tyrannosaurus rex"
}