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femto-
Pronunciation: /ˈfɛmtəʊ/

Definition of femto- in English:

combiningForm

(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 fortissimo
Pronunciation: fôrˈtisəˌmō
adverb
(especially as a direction) very loud or loudly