"petahertz" meaning in English

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        "3": "hertz"
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      "expansion": "peta- + hertz",
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  ],
  "etymology_text": "From peta- + hertz.",
  "forms": [
    {
      "form": "petahertz",
      "tags": [
        "plural"
      ]
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        }
      ],
      "derived": [
        {
          "tags": [
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          "word": "PHz"
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      ],
      "glosses": [
        "An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "id": "en-petahertz-en-noun-av1t2WDz",
      "links": [
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          "metrology",
          "metrology"
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        [
          "frequency",
          "frequency"
        ],
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          "hertz",
          "hertz"
        ]
      ],
      "raw_glosses": [
        "(metrology) An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "petahertz"
}

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  "derived": [
    {
      "tags": [
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      "word": "PHz"
    }
  ],
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    {
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  ],
  "etymology_text": "From peta- + hertz.",
  "forms": [
    {
      "form": "petahertz",
      "tags": [
        "plural"
      ]
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  "lang_code": "en",
  "pos": "noun",
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        "An SI unit of frequency equal to 10¹⁵ hertz."
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        ],
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        "(metrology) An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "topics": [
        "metrology"
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}