cis-

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.
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 ).

Origin:
< Latin; akin to here

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Collins
World English Dictionary
cis-
 
prefix
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]

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

cis-
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- 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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