Femtosecond Definition
 fĕmtə-sĕkənd 
  femtoseconds
  
    noun
  
 One quadrillionth (10−15 ) of a second.
 American Heritage 
Other Word Forms of Femtosecond
Noun
Singular:
 femtosecondPlural:
 femtosecondsOrigin of Femtosecond
-  femto- + second From Wiktionary 
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