Definition of cis- in English:

Share this entry


Pronunciation: /sɪs/


1On this side of; on the side nearer to the speaker. Often contrasted with trans- (sense 1) or ultra- (sense 2). cisatlantic
More example sentences
  • It is definitely one of the premier geological wonders of cislunar space.
  • The waters of cis-equatorial seas.
  • The generally accepted cis-oceanic ideas.
1.1 historical On the side nearer to Rome: cisalpine
1.2(Of time) closer to the present: cis-Elizabethan
More example sentences
  • I place him confidently not a trans-, but cis-reformation-man.
2Referring or relating to people whose sense of personal identity and gender corresponds with their birth sex. Compare with trans- (sense 3). cisgender cissexism
3 Chemistry (usually cis-) Denoting molecules with cis arrangements of substituents: cis-1,2-dichloroethene
More example sentences
  • Full X-ray crystallographic data were published (or deposited) for some of the isomerizing cis- or trans-cinnamic acids.
  • Analogous to other fruits, cis-neurosporene, neurosporene, carotene, and cis- carotene were also present among the visible light-absorbing compounds.
  • Similar effects were seen with 13 - cis-retinoic acid.


From Latin cis 'on this side of'.

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.