(rent′gən, runt′-; Ger. rœnt′gən) noun
The international unit of X–ray intensity; the quantity of radiation which, with full use of secondary electrons and without loss to the walls of the chamber, produces in 1 cubic centimeter of air at normal temperature and pressure 1 electrostatic unit of electricity of either sign: also spelled röntgen. [after Wilhelm Konrad Roentgen]

(rent′gən, runt′-; Ger. rœnt′gən), Wilhelm Konrad,
1845–1923, German physicist; discoverer of Roentgen rays, better known as X–rays.