in organic reaction mechanisms
The prefix for an @E02035@ or some part thereof indicating that the bond(s) undergoing primitive changes form part of a ring in the @T06468@ of the @E02035@. This prefix is used for nonpericyclic processes only and is replaced by 'cyclo' for pericyclic processes.
PAC, 1989, 61, 23. (System for symbolic representation of reaction mechanisms (Recommendations 1988)) on page 34 [Terms] [Paper]