Breadcrumb Home > Dictionary > Index T thermionics: Meaning and Definition of Find definitions for: therm•i•on•ics Pronunciation: (thûrm"ī-on'iks, thûr"mē-), [key] — n. (used with a sing. v.) the branch of physics that deals with thermionic phenomena. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thermionics (Thesaurus) thermionic current thermionic tube TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: ennui Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language