electrocyclic
/ɪˌlɛktrəʊˈsʌɪklɪk/ /ɪˌlɛktrəʊˈsɪklɪk/Chemistry
adjective
Designating a reaction characterized either by the formation of a single bond between the opposite ends of a conjugated organic molecule, forming a cyclic compound or cyclic intermediate, or by the converse process of breaking such a bond; of or relating to such a reaction.
Origin
1960s. From electro- + cyclic.