Breadcrumb Home > Dictionary > Index T thermonuclear reaction: Meaning and Definition of Find definitions for: thermonu'clear reac'tion Pronunciation: [key] — Chem., Physics. Chem.,Physics. a nuclear-fusion reaction that takes place between the nuclei of a gas, esp. hydrogen, heated to a temperature of several million degrees. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thermonuclear bomb Thermopane 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: avatar Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language