symphysis

plural symphyses

1. countableuncountableanatomyThe process of two originally separate bones growing together as the subject matures, as with the pubic bones or lower jawbones in humans.
2. A place where two bones are closely joined in the median plane of the body, either forming an immovable joint (as between the pubic bones in the center of the pelvis) or completely fused (as at the midline of the lower jaw).
   1. countableuncountableanatomyA line, discernable on an X-ray, showing such fusion.
   2. countableuncountableanatomyThe cartilaginous material that adjoins and facilitates the junction of such bones, without a synovial membrane.