Femtojoule Definition
    noun
  
 (metrology) An SI unit of energy, work, and heat equal to 10−15 joules.
Wiktionary 
Other Word Forms of Femtojoule
Noun
Singular:
 femtojoulePlural:
 femtojoulesOrigin of Femtojoule
-  femto- + joule. From Wiktionary 
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