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roentgen

in physics, 1896, in Roentgen rays "X-rays," in recognition of German physicist Wilhem Conrad Röntgen (1845-1923), who discovered X-rays in 1895. As a unit of exposure to radiation, it is attested from 1922, proposed in French in 1921.

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Definitions of roentgen from WordNet
1
roentgen (n.)
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air;
Synonyms: r
2
Roentgen (n.)
German physicist who discovered x-rays and developed roentgenography (1845-1923);
Synonyms: Wilhelm Konrad Roentgen / Rontgen / Wilhelm Konrad Rontgen
From wordnet.princeton.edu