"zeptogram" meaning in English

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  "etymology_text": "zepto- + gram",
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      "form": "zeptograms",
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        "An SI unit of mass equal to 10⁻²¹ grams. Symbol: zg"
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        "(metrology) An SI unit of mass equal to 10⁻²¹ grams. Symbol: zg"
      ],
      "topics": [
        "metrology"
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  "word": "zeptogram"
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  "etymology_text": "zepto- + gram",
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