cis
Pronunciation: /sɪs/
Definition of cis
adjective
Chemistry- denoting or relating to a molecular structure in which two particular atoms or groups lie on the same side of a given plane in the molecule, in particular denoting an isomer in which substituents at opposite ends of a carbon-carbon double bond are on the same side of the bond:the cis isomer of stilbeneCompare with trans1.
Origin:
independent usage of cis-