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The Clue

Units in nuclear physics (6 letter answer)

The Answer

FERMIS

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Notes

The answer FERMIS is so rare that it appears less than once every 2500 puzzles.

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)