From the Latin preposition cis (“on this side of”).
- On this side of, e.g. Cis-Neptunian object.
- (chemistry) 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.
- Cis; cisgender or cissexual, or pertaining to those who are cisgender or cissexual.
- This prefix is usually attached with a hyphen, but it is sometimes left detached, as a sort of adjective.