dictionary help<prefix>
1. A combining form or prefix 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. <chemistry> 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: Latin cis 'on this side of'
(20 Jun 2000)
cirsophthalmia, cirsotome, cirsotomy, CIS, CIS < Prev | Next > cis-1,2-dihydrobenzene-1,2-diol dehydrogenase
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