/ Dictionary / Index N nuclear physics: Meaning and Definition of Find definitions for: nu'clear phys'ics Pronunciation: [key] the branch of physics that deals with the behavior, structure, and component parts of atomic nuclei. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nuclear membrane nuclear power Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language