syndiotacticPronunciation: /ˌsɪndʌɪə(ʊ)ˈtaktɪk/Definition of syndiotactic adjective Chemistry (of a polymer or polymeric structure) in which the repeating units have alternating stereochemical configurations. Origin: 1950s: from Greek sunduo 'two together' + taktos 'arranged' + -icsyndiotactic in other Oxford dictionaries Definition of syndiotactic in the US English dictionary