/ Dictionary / Index T thermonuclear: Meaning and Definition of Find definitions for: ther•mo•nu•cle•ar Pronunciation: (thûr"mō-n'klē-ur, -ny'- or, by metathesis, -kyu-lur), [key] — adj. of, pertaining to, or involving a thermonuclear reaction: thermonuclear power. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thermonuclear (Thesaurus) thermomotor thermonuclear bomb Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language