In the centrosymmetric dinuclear title compound, [Cd(2)(C(14)H(9)O(4))(2)Cl(2)(C(15)H(11)N(3))(2)]·0.5H(2)O, each of the Cd(II) ions is coordinated by three N atoms from a chelating 2,2':6',2''-terpyridine ligand, two bridging Cl atoms and one O atom of a 2'-carb-oxy-[1,1'-biphen-yl]-2-carboxyl-ate anion. The coordination environment is distorted octa-hedral. In the crystal, inter-molecular O-H⋯O hydrogen bonds link symmetry-related mol-ecules, forming an infinite chain. The half-occupancy water mol-ecule is disordered over two general sites with 0.25 occupancy and is, in turn, disordered over an inversion center.