Definition of femto- in English:


Syllabification: femto-

combining form

  • (Used in units of measurement) denoting a factor of 10−15: femtosecond


from Danish or Norwegian femten 'fifteen'.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space