[sym.phy.sis] n, pl -phy.ses [NL, fr. Gk, state of growing together, fr. symphyesthai to grow together, fr. syn- + phyein to make grow, bring forth--more at be] (ca. 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