femtosecond

1. is a type of: time unit, unit of time - a unit for measuring time periods
   has: attosecond - one quintillionth (10^-18) of a second; one thousandth of a femtosecond
   is a part of: picosecond - one trillionth (10^-12) of a second; one thousandth of a nanosecond

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