atactic

adjective

atac·​tic (ˌ)ā-ˈtak-tik 

: of, relating to, or being a polymer exhibiting no stereochemical regularity of structure

atactic polypropylene

compare isotactic

Word History

Etymology

International Scientific Vocabulary a- entry 2 + -tactic

First Known Use

1957, in the meaning defined above

Medical Definition

atactic

adjective

atac·​tic (ˈ)ā-ˈtak-tik 

: lacking regularity or coordination

specifically : characterized by ataxia