Definition, Meaning & Synonyms

cis

Adjective

/sɪs/

Definition

A prefix used in chemistry to indicate that certain atoms or groups in a molecule are positioned on the same side of a double bond or around a ring structure.

Examples

In ‘cis-butene’, the two methyl groups are positioned on the same side of the double bond.
Cis configurations can influence the physical properties of molecules, such as boiling points.

Meaning

In the context of chemistry, ‘cis’ refers to the arrangement of atoms in a molecule where particular parts are on the same side, as opposed to ‘trans’, where they are on opposite sides.