/ Dictionary / Index N nuclear isomer: Meaning and Definition of Find definitions for: nu'clear i'somer Pronunciation: [key] — Physics. Physics. isomer (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nuclearism nuclear isomerism Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language