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 ).
Chemistry. 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. Compare trans- ( def 2 ).

< Latin; akin to here Unabridged


Commonwealth of independent States.

Commonwealth of Independent States

an alliance of former Soviet republics formed in December 1991, including: Armenia, Azerbaijan, Belarus, Kazakhstan, Kyrgyzstan, Moldova, Russian Federation, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan. Abbreviation: C.I.S. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
abbreviation for
Commonwealth of Independent States

1.  on this or the near side of: cisalpine
2.  Compare trans- (often in italics) indicating that two groups of atoms in an unsaturated compound lie on the same side of a double bond: cis-butadiene
[from Latin]

Commonwealth of Independent States
CIS a loose organization of former Soviet republics, excluding the Baltic States, formed in 1991

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning "on the near side of, on this side of," from L. preposition cis "on this side of," related to citra (adv.) "on this side." Opposed to trans- or ultra-.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cis (sĭs)
Having two mutations on two genes on the same chromosome of a homologous pair. Often italic.

cis- pref.
Often cis- Having a pair of identical atoms or groups on the same side of a plane that passes through two carbon atoms linked by a double bond: cis-butene.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
  1. Cancer Information System

  2. carcinoma in situ

  3. Commonwealth of Independent States

  4. CompuServe Information Service

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for CIS
Cis isomers and trans isomers often have different physical properties.
The cis isomer is called maleic acid and the trans is named fumaric acid.
In this case, the cis isomer is more stable than the trans isomer.
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