cis-trans isomerism(redirected from geometric isomer)
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Related to geometric isomer: Optical isomers
cis-trans isomerism[′si¦stranz ī′säm·ə‚riz·əm]
A type of geometrical isomerism found in alkenic systems in which it is possible for each of the doubly bonded carbons to carry two different atoms or groups; two similar atoms or groups may be on the same side (cis) or on opposite sides (trans) of a plane bisecting the alkenic carbons and perpendicular to the plane of the alkenic system.