cis- Hear it!

cis- definition

cis- (sis)

  1. on this side of cisalpine
  2. subsequent to
  3. Chem. designating an isomer having certain atoms or groups on the same side of a given plane in the molecule: in chemical names, usually printed in italic type and hyphenated and disregarded in alphabetization cis-butene

Etymology: < L cis, on this side: see here

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