/ Dictionary / Index I interionic: Meaning and Definition of Find definitions for: in•ter•i•on•ic Pronunciation: (in"tur-ī-on'ik), [key] — adj. between ions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interinsurance interior Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language