Coolidge tube
/ˈkuːlɪdʒ ˌtjuːb/ /ˈkuːlɪdʒ ˌtʃuːb/Physics
noun
A type of hot-cathode X-ray tube using a tungsten filament and used especially as the basis of tubes in medical X-ray devices.
Origin
Early 20th century; earliest use found in The Times. From the name of William D. Coolidge, U.S. physicist, who developed the tube + tube.