Atactic is a term that refers to a type of polymer structure that is amorphous or disordered. It is a term frequently used in the chemistry and materials science fields. Synonyms for the word atactic include isotactic, syndiotactic, and hemiisotactic. Isotactic refers to a polymer structure that has regular and ordered sequences, while syndiotactic refers to a structure with alternating sequences. Hemiisotactic is a less commonly used term that refers to a structure with only partial regularity. These terms are important for researchers and scientists working in the field of polymer science to accurately describe the structure and properties of different polymers.