geometric isomerism

== English == === Noun === geometric isomerism (uncountable) (chemistry) (dated, deprecated by IUPAC) A form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides; these are cis- and trans- isomers, respectively. ==== Synonyms ==== cis-trans isomerism ==== Translations ==== === See also === structural isomerism optical isomerism