roentgeno-, roentgen- +
(German: radiation, "x-ray"; X-ray; 1896, translation of German X-strahl, from X, "algebraic symbol for an unknown quantity", + Strahl, "beam, ray")
So called after its discoverer, a German physicist, Wilhelm Konrad Roentgen [1845-1923], who discovered roentgen rays [x-rays] in 1895; winner of the Nobel prize in physics in 1901.
2. To make a radiograph.
2. A film produced by radiography.
2. Radiology, the science of radiation and, specifically, the use of both ionizing (like X-ray) and nonionizing (like ultrasound) modalities for the diagnosis and treatment of disease.
Roentgenology is named for Wilhelm Conrad Roentgen who discovered X-rays. Roentgen, a professor of physics in Germany, wanted to prove his hypothesis that cathode rays could penetrate substances besides air.
When he saw that he could film his thumb and forefinger and their bones on a screen, the story goes that he replaced the screen with a photographic plate and X-rayed his wife's hand.
Roentgen's report of his findings, "On a New Kind of Rays", was published by the Physical-Medical Society of Würzburg, Germany, in December 1895.
2. An instrument designed for measuring the mechanical effect of radiant energy.
It consists of a number of light discs, blackened on one side, placed at the ends of extended arms, supported on a pivot in an exhausted glass vessel.
When exposed to rays of light or heat, the arms rotate.
There are roentgenopaque materials that are not penetrable by roentgen rays at the commonly used diagnostic energy procedures. Such roentgenopaque areas appear light or white on exposed films.