Biphenyl is an organic compound that is commonly used in the manufacture of industrial materials. There are several synonyms for biphenyl, including diphenyl, 1,1'-biphenyl, and phenylbenzene. Other less commonly used synonyms include dibenzene, benzidine, and diphenylylene. These synonyms are often used in scientific or chemical contexts, and their use may vary depending on the specific application or industry. Despite their differences, all of these terms generally refer to the same chemical compound, which is characterized by its two benzene rings connected by a single bond. Biphenyl and its synonyms are important compounds that have a wide range of applications in industrial, scientific, and medical fields.