Merriam-Webster Collegiate Dictionary - symphysis

 noun  (plural symphyses)  Etymology: New Latin, from Greek, state of growing together, from symphyesthai to grow together, from syn- + phyein to make grow, bring forth — more at be  Date: circa 1578  1. an immovable or more or less movable articulation of various bones in the median plane of the body  2. an articulation in which the bony surfaces are connected by pads of fibrous cartilage without a synovial membrane