/ Dictionary / Index I isosteric: Meaning and Definition of Find definitions for: i•so•ster•ic Pronunciation: (ī"su-ster'ik), [key] — adj. having the same number of valence electrons in the same configuration but differing in the kinds and numbers of atoms. having or showing equal atmospheric density. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isostere isosterism Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language