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noun
A metric unit of length equal to one quadrillionth of a meter.
synonyms: femtometer, fermi.
is a specific kind of: metric linear unit.
is a part of: micromicron, picometer, picometre.
domain region: Canada | Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland.
Polish: femtometr, fermi, fm
Find more on femtometre elsewhere: etymology - rhymes - Wikipedia.
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