a cathode ray tube, used for x-ray production, in which a beam of thermoelectrons is produced by heating a wire cathode.
The Origin (And Grammar) Of Father’s DayStrangely, the origin of Father's Day lies in two unrelated tragic events.
Origin of Coolidge tube
1910–15, Americanism; named after William D. Coolidge (1873–1975), U.S. physicist and chemist who devised it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019