prefix

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

  Often contrasted with trans- (sense 1) or ultra- (sense 2)

  ‘cisatlantic’

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  • ‘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. 1.1historical On the side nearer to Rome.
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     • ‘cisalpine’
  2. 1.2(of time) closer to the present.
     ‘cis-Elizabethan’
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     • ‘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’

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  • ‘cissexism’

• 3usually cis-Chemistry
  Denoting molecules with cis arrangements of substituents.

  ‘cis-1,2-dichloroethene’

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  • ‘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.’
  • ‘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.’
  • ‘This enzyme inserts a cis-double bond at carbon 9.’