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In the centrosymmetric dinuclear title compound, [Cd2(C14H9O4)2Cl2(C15H11N3)2]·0.5H2O, each of the CdII 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′-carboxy-[1,1′-biphenyl]-2-carboxylate anion. The coordination environment is distorted octahedral. In the crystal, intermolecular O—H...O hydrogen bonds link symmetry-related molecules, forming an infinite chain. The half-occupancy water molecule is disordered over two general sites with 0.25 occupancy and is, in turn, disordered over an inversion center.