| 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. | 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). |
| Commonwealth of Independent States. |
| CIS abbr. Commonwealth of Independent States |
| Commonwealth of Independent States Abbr. CIS An association of former Soviet republics that was established in December 1991 by Russia, Ukraine, and Belarus to help ease the dissolution of the Soviet Union and coordinate interrepublican affairs. Other members include Armenia, Azerbaijan, Georgia, Kazakhstan, Kyrgyzstan, Moldova, Tajikistan, Turkmenistan, and Uzbekistan. |
cis (sĭs)
adj.
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.
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