isotactic
adjective
iso·tac·tic ˌī-sə-ˈtak-tik 
: having or relating to a stereochemical regularity of structure in the repeating units of a polymer compare atactic
Word History
First Known Use
1955, in the meaning defined above
Medical Definition
isotactic
adjective
iso·tac·tic ˌī-sə-ˈtak-tik
: having or relating to a stereochemical regularity of structure in the repeating units of a polymer