Dictionary  cis-1. a prefix occurring in loanwords from Latin meaning “on the near side of ” (cisalpine); on this model, used in the formation of compound words (cisatlantic). 2. Chem.a specialization of this denoting a geometric isomer having a pair of identical atoms or groups attached on the same side of two atoms linked by a double bond. Cf. trans- (def. 2). C.I.S.Commonwealth of Independent States. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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