A symphysis (/ˈsɪm.fɪ.sɪs/, pl. symphyses)is a fibrocartilaginous fusion between two bones. It is a type of cartilaginous joint, specifically a secondary cartilaginous joint. 1. * A symphysis is an amphiarthrosis, a slightly movable joint. 2. * A growing together of parts or structures. Unlike synchondroses, symphyses are permanent.