One of the mysteries of the English language finally explained.
The therapeutic use of X-rays; radiotherapy; radiation therapy.
Early 20th century; earliest use found in Journal of the American Medical Association. From Roentgen + therapy, probably after German Röntgentherapie; compare French röntgenthérapie.
roentgen therapy/ˈrʌntɡən ˌθɛrəpi//ˈrʌntjən ˌθɛrəpi/
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