Definition of "femtometer" []

• US spelling of femtometre: A length of 10-15 of a meter, 1 quadrillionth of a meter. (noun)

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• "Femto-neutrons or 'femtons' are fast neutrons of femtometer wavelength, a million times shorter than the current nanotechnology diagnostic probes which operate on nanometer scale."
• "I'm sure that there's a reason you started to ask about making some kind of measurement at the 100 femtometer level but for now you've just baffled me."
• "The first unit to go into the field, pictured below, "can detect a 10 femtometer change in the position of its center chip."