Definition of femtosecond in English:

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femtosecond

Pronunciation: /ˈfemtōˌsekənd/
(abbreviation fs)

noun

One quadrillionth of a second.
Example sentences
  • With femtosecond pulses, scientists could for the first time directly observe the shifts in interatomic spacings that take place during reactions.
  • A femtosecond is to one second in duration what one second is to 30 million years.
  • In other words, what could you do with a femtosecond x-ray source?

For editors and proofreaders

Syllabification: fem·to·sec·ond

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