- Prefix (in italics) meaning on this side, on the near side; opposite of trans-.
- genetics a prefix denoting the location of two or more genes on the same chromosome of a homologous pair, in coupling.
- organic chemistry a form of geometric isomerism with regard to carbon-carbon double bonds. Identical functional groups on the same side of the double bond are cis-. When the four moieties attached to the carbons of the double bond are all different, then the E/Z nomenclature has to be followed.
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Examples: glitazone, GI cocktail, etc.