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The Clue

First Nobelist in Physics (8 letter answer)

The Answer

ROENTGEN

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Notes

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

Definition

ROENTGEN as a noun:

1. (roentgen, R) = a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
2. (Roentgen, Wilhelm Konrad Roentgen, Rontgen, Wilhelm Konrad Rontgen) = German physicist who discovered x-rays and developed roentgenography (1845-1923)