Definition of cis- in English:

cis-

prefix

  • 1On this side of; on the side nearer to the speaker.

    ‘cisatlantic’
    Often contrasted with trans- (sense 1) or ultra- (sense 2)
    • ‘The waters of cis-equatorial seas.’
    • ‘The generally accepted cis-oceanic ideas.’
    • ‘It is definitely one of the premier geological wonders of cislunar space.’
    1. 1.1historical On the side nearer to Rome.
      ‘cisalpine’
    2. 1.2 (of time) closer to the present.
      ‘cis-Elizabethan’
      • ‘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.

    ‘cisgender’
    Compare with trans- (sense 3)
    ‘cissexism’
  • 3usually cis-Chemistry
    Denoting molecules with cis arrangements of substituents.

    ‘cis-1,2-dichloroethene’
    • ‘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.’
    • ‘This enzyme inserts a cis-double bond at carbon 9.’
    • ‘Trans-fatty acids raise LDL cholesterol levels and lower HDL cholesterol levels relative to cis-unsaturated fatty acids and may increase the risk of diabetes.’
    • ‘Full X-ray crystallographic data were published (or deposited) for some of the isomerizing cis- or trans-cinnamic acids.’

Origin

From Latin cis ‘on this side of’.

Pronunciation

cis-

/sɪs/