/ Dictionary / Index I isospin: Meaning and Definition of Find definitions for: i•so•spin Pronunciation: (ī'su-spin"), [key] — n. Physics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isosorbide dinitrate isostasy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language