/ Dictionary / Index I isoionic point: Meaning and Definition of Find definitions for: i'so•i•on'ic point' Pronunciation: (ī'sō-ī-on'ik, ī"sō-), [key] — Chem. Chem. the hydrogen ion concentration at which the concentration of the dipolar ion is at a maximum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isohyet isokeraunic 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