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Medical Definition of Zusammen
1. 1. Synonym: cis-. 2. A form of geometric isomerism with regards to carbon-carbon double bonds in which all four moieties attached to the carbons are different. If the substituents with the higher ranking (based on established rules) are on the same side of the double bond, Z is used. See: entgegen. Origin: Ger. Together (05 Mar 2000)