/ Dictionary / Index N nuclear warhead: Meaning and Definition of Find definitions for: nu'clear war'head. Pronunciation: [key] a warhead containing a fission or fusion bomb. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Nuclear Test-Ban Treaty nuclear waste Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language