Definition of Cis-
1. Prefix. On this side of, e.g. Cis-Neptunian object. ¹
2. Prefix. (chemistry) (non-gloss definition Forming names of chemical compounds in which two atoms or groups are situated on the same side of some plane of symmetry passing through the compound.) ¹
¹ Source: wiktionary.com
Medical Definition of Cis-
1.
1. Prefix meaning on this side, on the near side; opposite of trans-.
2. A prefix denoting the location of two or more genes on the same chromosome of a homologous pair, in coupling.
3. A form of geometric isomerism in which similar functional groups are attached on the same side of the plane that includes two adjacent, fixed carbon atoms (e.g., the 2-and 3-OH groups of ribofuranose) in a ring structure. 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.
Origin: L.
(20 Jun 2000)
Lexicographical Neighbors of Cis-
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