| NOUN | quantity | femtometer, femtometre, fermi | a metric unit of length equal to one quadrillionth of a meter |
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| Meaning | A metric unit of length equal to one quadrillionth of a meter. | |
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| Synonyms | femtometre, fermi | |
| Part of | picometer, picometre, micromicron | A metric unit of length equal to one trillionth of a meter |
| Broader | metric linear unit | A linear unit of distance in metric terms |
| Spanish | femtometer, femtometre, femtometro | |
| Catalan | femtometer, femtometre, fermi | |
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