Femtocoulomb Definition
    noun
  
 (metrology) An SI unit of electrical charge equal to 10−15 coulombs.
Wiktionary 
Other Word Forms of Femtocoulomb
Noun
Singular:
 femtocoulombPlural:
 femtocoulombsOrigin of Femtocoulomb
-  femto- + coulomb. From Wiktionary 
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