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from The Century Dictionary and Cyclopedia

  • n. On this side of (a designated period of time): as, “cis-Reformation,” , “cis-Elizabethan,”
  • n. In chem., a prefix used, in contrast with trans- or cis-trans-, to designate a compound in which two atoms or groups are supposed to be situated on the same side of some plane of symmetry passing through the compound.


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