Definition of "atactic" []

• Of or pertaining to ataxia (adjective)
• Describing any regular polymer or other macromolecule in which the orientation of the subunits is random (adjective)

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• "Prof. Natta extended the research conducted by Ziegler on organometallic catalysts to the stereospecific polymerization, thus discovering new classes of polymers with a sterically ordered structure, viz. isotactic, syndiotactic and di-isotactic polymers and linear non branched olefinic polymers and copolymers with an atactic (or sterically nonordered) structure."