"femtojoule" meaning in English

{
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        "2": "femto",
        "3": "joule"
      },
      "expansion": "femto- + joule",
      "name": "prefix"
    }
  ],
  "etymology_text": "From femto- + joule.",
  "forms": [
    {
      "form": "femtojoules",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "femtojoule (plural femtojoules)",
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "name": "English terms prefixed with femto-",
          "parents": [],
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            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "An SI unit of energy, work, and heat equal to 10⁻¹⁵ joules. Symbol: fJ"
      ],
      "id": "en-femtojoule-en-noun-iPEPYfJX",
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "energy, work, and heat",
          "energy, work, and heat#English"
        ],
        [
          "joule",
          "joule"
        ],
        [
          "fJ",
          "fJ"
        ]
      ],
      "raw_glosses": [
        "(metrology) An SI unit of energy, work, and heat equal to 10⁻¹⁵ joules. Symbol: fJ"
      ],
      "synonyms": [
        {
          "sense": "Symbol",
          "word": "fJ"
        }
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "femtojoule"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "femto",
        "3": "joule"
      },
      "expansion": "femto- + joule",
      "name": "prefix"
    }
  ],
  "etymology_text": "From femto- + joule.",
  "forms": [
    {
      "form": "femtojoules",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "An SI unit of energy, work, and heat equal to 10⁻¹⁵ joules. Symbol: fJ"
      ],
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "energy, work, and heat",
          "energy, work, and heat#English"
        ],
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          "joule"
        ],
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          "fJ",
          "fJ"
        ]
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        "(metrology) An SI unit of energy, work, and heat equal to 10⁻¹⁵ joules. Symbol: fJ"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "Symbol",
      "word": "fJ"
    }
  ],
  "word": "femtojoule"
}