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Coolidge tube

noun, Physics.
1.
a cathode ray tube, used for x-ray production, in which a beam of thermoelectrons is produced by heating a wire cathode.
Origin
1910-1915
1910-15, Americanism; named after William D. Coolidge (1873-1975), U.S. physicist and chemist who devised it
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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