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'.

Definition of femto- in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose