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WordNet-Online 
 Definitions from WordNet
Noun femtometer has 1 sense 
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| Definitions from the WebFemtometerNoun: A femtometer is a unit of length in the metric system, equal to one quadrillionth of a meter. Example sentence: The size of an atom is usually measured in femtometers. Adjective: When used as an adjective, femtometer describes anything related to or involving a length of one femtometer. Example sentence: The femtometer-scale precision of the scientific instrument allowed for incredibly accurate measurements. Related products on Amazon: Femtometer Measurement Tools, Femtometer-Scale Instruments | ||||
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