cis-

Definition:

1. Prefix (in italics) meaning on this side, on the near side; opposite of trans-.
2. genetics a prefix denoting the location of two or more genes on the same chromosome of a homologous pair, in coupling.
3. 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.

See: entgegen, zusammen

Synonym(s): zusammen1

[L.]

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