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femto-

  1. a combining form used in the names of units of measurement which are 10− 15 (one quadrillionth) smaller than the unit denoted by the base word.


femto-

prefix

  1. denoting 10 –15 f

    femtometer



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Word History and Origins

Origin of femto-1

< Danish, Norwegian femt ( en ) fifteen + -o-

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Word History and Origins

Origin of femto-1

from Danish or Norwegian femten fifteen

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