"gyrochronology" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "gyro",
        "3": "chronology"
      },
      "expansion": "gyro- + chronology",
      "name": "prefix"
    }
  ],
  "etymology_text": "gyro- + chronology",
  "head_templates": [
    {
      "args": {
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      "expansion": "gyrochronology (uncountable)",
      "name": "en-noun"
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  ],
  "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"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with gyro-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
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            "Space",
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            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "A method of estimating the age of a star by measuring its rotation rate"
      ],
      "id": "en-gyrochronology-en-noun---GujzSS",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "age",
          "age"
        ],
        [
          "star",
          "star"
        ],
        [
          "rotation",
          "rotation"
        ]
      ],
      "raw_glosses": [
        "(astronomy) A method of estimating the age of a star by measuring its rotation rate"
      ],
      "related": [
        {
          "word": "gyrochronological"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "gyrochronology"
}

{
  "etymology_templates": [
    {
      "args": {
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        "2": "gyro",
        "3": "chronology"
      },
      "expansion": "gyro- + chronology",
      "name": "prefix"
    }
  ],
  "etymology_text": "gyro- + chronology",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "gyrochronology (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "gyrochronological"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with gyro-",
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        "en:Astronomy"
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      "glosses": [
        "A method of estimating the age of a star by measuring its rotation rate"
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "age",
          "age"
        ],
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          "star",
          "star"
        ],
        [
          "rotation",
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        ]
      ],
      "raw_glosses": [
        "(astronomy) A method of estimating the age of a star by measuring its rotation rate"
      ],
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        "uncountable"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
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  "word": "gyrochronology"
}