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Femtometre

noun

Definitions

Noun
  1. 1
    An SI unit of length equal to 10⁻¹⁵ metres. Symbol: fm

    "Holonyms: picometre < nanometre < micrometre < millimetre < centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre < exametre < zettametre < yottametre < ronnametre < quettametre"

  2. 2
    a metric unit of length equal to one quadrillionth of a meter wordnet

Etymology

From femto- + metre.

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