Coolidge tube

Coolidge tube

 
noun Physics.
a cathode ray tube, used for x-ray production, in which a beam of thermoelectrons is produced by heating a wire cathode.
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Origin:
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. 2012.
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Coolidge tube is always a great word to know.
So is gas. Does it mean:
a longitudinal wave in an elastic medium, especially a wave producing an audible sensation
a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid
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