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Noun1.femtometer - a metric unit of length equal to one quadrillionth of a meter
metric linear unit - a linear unit of distance in metric terms
micromicron, picometer, picometre - a metric unit of length equal to one trillionth of a meter
References in periodicals archive ?
Engineers follow the rabbit down the hole to places that may be the tiny size of a femtometer or the absurdly large size of a gigameter; to them the physical size does not matter.
Note that the femtometer scale for the displacement does not imply that AE sensors can detect such signals.
I could do even better if Google allowed am as an abbreviation for attometer or fm as an abbreviation for femtometer. As well as the largest and smallest numeric values in Darryl Francis's article, there could be a category for longest phrase with no repeating letters."