femtosecond
Noun

femtosecond (plural femtoseconds)

  1. A unit of time equal to 0.000 000 000 000 001 seconds (i.e. 1x10-15 seconds) and with symbol fs.
    • 2012, Mark Cendrowski, The Big Bang Theory, Season 5, Episode 18, "The Werewolf Transformation":
      Sheldon Cooper: My hair is growing at the rate of 4.6 yoctometers per femtosecond.
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