Femto- Definition

femtō
prefix
One quadrillionth (10−15 ).
Femtovolt.
American Heritage

In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10−15. Symbol: f.

Wiktionary
affix
One quadrillionth part of; the factor 10-15
Femtosecond.
Webster's New World

Origin of Femto-

  • From Danish Norwegian femten fifteen from Old Norse fimmtān penkwe in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Danish femten (“fifteen”).

    From Wiktionary

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