bicyclic

1. (physical chemistry) Having two rings of atoms in the molecule; the rings may be fused, as in naphthalene, or separate, as in biphenyl.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."; "These geometries are almost reversed in the triplets. The 1,3-borazyne (III) shows more bicyclic character than the corresponding m-benzyne"; "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"not-comparablephysical