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Noun
femtometer
femtometre
fermi
Definition: a metric unit of length equal to one quadrillionth of a meter
Fermi
Enrico Fermi
Definition: Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954)
Definition: An obsolete unit of length equal to one femtometer or femtometre (10^(−15) m).