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Noun: femtometer
Usage: US (elsewhere: femtometre)
  1. A metric unit of length equal to one quadrillionth of a meter
    - femtometre [Brit, Cdn], fermi

Derived forms: femtometers

Type of: metric linear unit

Part of: micromicron, picometer [US], picometre [Brit, Cdn]

Encyclopedia: Femtometer