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Noun: femtosecond  'fem-tow,se-kund
  1. One quadrillionth (10^-15) of a second; one thousandth of a picosecond
    "Femtosecond lasers are used in eye surgery for their precision"

Derived forms: femtoseconds

Type of: time unit, unit of time

Part of: picosecond

Encyclopedia: Femtosecond