Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- prefix On this side.
- prefix 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. Used of a geometric isomer.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[Latin, from cis, on this side of; see ko- in Indo-European roots.]
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