Breadcrumb Home > Dictionary > Index C Cite Coolidge tube: Meaning and Definition of Find definitions for: Cool'idge tube" Pronunciation: [key] ? Physics. Physics. a cathode ray tube, used for x-ray production, in which a beam of thermoelectrons is produced by heating a wire cathode. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. Coolidge coolie TrendingHere are the facts and trivia that people are buzzing about. February 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress Noble Titles and Ranks in a Monarchy Keeping Your Brain Active in a COVID-19 World The Manchu Related Content Daily Word Quiz: invective Analogy of the Day: Today?s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language