There are 2 definitions of CIS in English:

CIS

Syllabification: CIS

abbreviation

  • Commonwealth of Independent States.

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Word of the day tortie
Pronunciation: ˈtɔːtiː
noun
a tortoiseshell cat

There are 2 definitions of CIS in English:

cis

Syllabification: cis

adjective

Chemistry
  • Denoting or relating to a molecular structure in which two particular atoms or groups lie on the same side of a given plane in the molecule, in particular denoting an isomer in which substituents at opposite ends of a carbon-carbon double bond are on the same side of the bond: the cis isomer of stilbene Compare with trans1.
    More example sentences
    • But ultraviolet light converts the molecule to the cis isomer, in which both propellers are on the same side.
    • Examples of stereoisomers include the cis and trans isomers of the alkenes.
    • For example, the cis double bond at the centre of the fatty chain in erucamide and oleamide appears vital for slip performance.

Origin

independent usage of cis-.

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