WordReference Random House Unabridged Dictionary of American English © 2024cis-, - 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). - Chemistrya 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. Cf. trans- (def. 2).
C.I.S., - Place NamesCommonwealth of Independent States.
Collins Concise English Dictionary © HarperCollins Publishers::
CIS abbreviation for - Commonwealth of Independent States
Collins Concise English Dictionary © HarperCollins Publishers::
cis- prefix - on this or the near side of
Etymology: from Latin