Definition of femto- in English:

femto-

Pronunciation: /ˈfɛmtəʊ/

combining form

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

Origin

from Danish or Norwegian femten 'fifteen'.

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Word of the day grotesquerie
Pronunciation: grəʊˈtɛskəri
noun
grotesque quality or grotesque things collectively