roentgen
UK[ˈrɜːntjən]US[ˈrentɡən]
n
A unit of measurement for exposure to ionizing radiation, such as X-rays or gamma rays.
n
(also roentgen ray) An old-fashioned term for an X-ray.
Etymology
The term 'roentgen' is an eponym, directly borrowed from the surname of Wilhelm Conrad Röntgen (1845–1923). In 1895, Röntgen discovered a new form of penetrating radiation, which he termed "X-rays." The scientific community later honored his achievement by naming the unit of radiation exposure after him. The word entered English usage in the early 20th century, first referring to the rays themselves and later solidifying as a precise unit of measurement in radiology and physics, thus transforming a personal name into a fundamental scientific term.
Analysis
The word is a proper noun eponym, derived from the surname of the German physicist Wilhelm Conrad Röntgen, who discovered X-rays. It is not composed of separable, meaningful morphemes in English.
Examples
The patient received a dose of several roentgens during the diagnostic procedure.
Early researchers faced hazards from uncontrolled exposure to roentgen rays.
The meter was calibrated to measure radiation in milliroentgens per hour.