/ Dictionary / Index I iso-osmotic: Meaning and Definition of Find definitions for: i•so-os•mot•ic Pronunciation: (ī"sō-oz-mot'ik, -os-), [key] — adj. Physical Chem. isotonic (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isooctane isopach 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