/ Dictionary / Index I ionomer: Meaning and Definition of Find definitions for: i•on•o•mer Pronunciation: (ī-on'u-mur), [key] — n. Chem. any of a class of plastics that because of its ionic bonding action is capable of conducting electric current. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ionogen ionone Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language