Definition of femto- in English:

femto-

Syllabification: femto-

combining form

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

Origin

from Danish or Norwegian femten 'fifteen'.

Definition of femto- in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)