bicyclic

1. not comparableHaving two cycles.
2. not comparablechemistryHaving two rings of atoms in the molecule; the rings may be fused, as in naphthalene, or separate, as in biphenyl.

   These geometries are almost reversed in the triplets. The 1,3-borazyne (III) shows more bicyclic character than the corresponding m-benzyne

   2006, PJ Fazen, LA Burke, “Theoretical studies of borazynes and azaborines”, in Inorganic chemistry, ACS Publications

   2 more examples

   […] substitution of a carboxylate would be expected to destabilize the dritterionic mesomer that contributes to the singlet valence bond description as the benzyne geometry becomes more bicyclic.

   2003, Journal of the American Chemical Society, volume 125, page 134

   On the basis of a comparison of calculated and measured IR data, the 2 B 2 state could undoubtedly be discarded in favor of a more bicyclic geometry

   2007, S Venkataramani, M Winkler, “Trifluoro‐1, 3, 5‐tridehydrobenzene”, in Angewandte Chemie, Wiley Online Library

plural bicyclics

1. physicalchemistryA bicyclic compound.