1. [ noun ] (physics,nuclear physics) 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)
Synonyms: enrico_fermi
Related terms: nuclear_physicist
2. [ noun ] a metric unit of length equal to one quadrillionth of a meter
Synonyms: femtometre femtometer
Related terms: metric_linear_unit picometer
Similar spelling:   Ferrin