"gigagram" meaning in English

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      "expansion": "giga- + gram",
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  "etymology_text": "From giga- + gram.",
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      "form": "gigagrams",
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      "glosses": [
        "An SI unit of mass equal to 10⁹ grams. Symbol: Gg"
      ],
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          "metrology",
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          "mass",
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        [
          "Gg",
          "Gg"
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        "(metrology) An SI unit of mass equal to 10⁹ grams. Symbol: Gg"
      ],
      "synonyms": [
        {
          "word": "kilotonne"
        }
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "gigagram"
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  ],
  "etymology_text": "From giga- + gram.",
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    {
      "form": "gigagrams",
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        "plural"
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        "An SI unit of mass equal to 10⁹ grams. Symbol: Gg"
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        "(metrology) An SI unit of mass equal to 10⁹ grams. Symbol: Gg"
      ],
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        "metrology"
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  "synonyms": [
    {
      "word": "kilotonne"
    }
  ],
  "word": "gigagram"
}