/ Dictionary / Index N nucleonics: Meaning and Definition of Find definitions for: nu•cle•on•ics Pronunciation: (n"klē-on'iks, ny"-), [key] — n. (used with a sing. v.) the branch of science that deals with nuclear phenomena, as radioactivity, fission, or fusion, esp. practical applications, as in industrial engineering. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nucleonics (Thesaurus) nucleon nucleophilic Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language