Definition of bicycloannulation in English:
bicycloannulation
noun bʌɪˌsʌɪkləʊˌanjʊˈleɪʃnbʌɪˈsɪkləʊˌanjʊˈleɪʃn
Chemistry A process in which a molecule undergoes one or more addition reactions leading to the formation of two adjoining rings.
Origin
1970s. From bi- + cyclo- + annulation.