Dictionary  Roent•genPronunciation: (rent'gun, -jun, runt'-; for 1 also Ger. rœnt'gun), [key] —n. 1. Wil•helm Kon•rad Pronunciation: (wil'helm kon'rad; Ger. vil'helm kôn'rät), [key] 1845–1923, German physicist: discoverer of x-rays 1895; Nobel prize 1901. 2. (l.c.) Physics.a unit of exposure dose that measures x-rays or gamma rays in terms of the ions or electrons produced in dry air at 0° C and one atmosphere, equal to the amount of radiation producing one electrostatic unit of positive or negative charge per cubic centimeter of air. Abbr.: r, R —adj. (sometimes l.c.) of or pertaining to Wilhelm Roentgen, the Roentgen unit, or esp. to x-rays. Also,Röntgen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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