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Meaning of isotactic

i•so•tac•tic

Pronunciation: (ī"su-tak'tik), [key]
— adj. Chem.
  1. (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.