The Clue
Physicist's unit of length (5 letter answer)
The Answer
FERMI
Tags
Notes
The answer FERMI is uncommon, appearing about once every 425 puzzles.
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Definition
FERMI as a noun:
1. (femtometer, femtometre, fermi) = a metric unit of length equal to one quadrillionth of a meter
2. (Fermi, Enrico Fermi) = 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)