WordReference Random House Unabridged Dictionary of American English © 2026
i•so•tac•tic
(ī′sə tak′tik),USA pronunciation adj. [Chem.]
i•so•tac•tic•i•ty
(ī′sō tak tis′i tē),USA pronunciation n.
- Chemistry(of a polymer) having the same configuration at successive, regularly spaced positions along the chain. Cf. configuration (def. 5).
- 1950–55; iso- + tactic