/ Dictionary / Index S spallation: Meaning and Definition of Find definitions for: spall•a•tion Pronunciation: (spô-lā'shun), [key] — n. Physics. a nuclear reaction in which several nucleons are released from the nucleus of an atom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spallation (Thesaurus) Spallanzani spalpeen Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language