Definition of cis- in English:

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1On this side of; on the side nearer to the speaker. Often contrasted with trans- (sense 1) or ultra- (sense 1). cisatlantic cislunar
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-dichloroethylene
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'.

For editors and proofreaders

Syllabification: cis-

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