/ Dictionary / Index I isotactic: Meaning and Definition of Find definitions for: i•so•tac•tic Pronunciation: (ī"su-tak'tik), [key] — adj. Chem. (of a polymer) having the same configuration at successive, regularly spaced positions along the chain. Cf. configuration (def. 5). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isotach isothere 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