[ ˌsɪŋkɒn'drəʊsɪs ]
■ noun ( plural synchondroses -si:z ) Anatomy an almost immovable joint between bones bound by a layer of cartilage, as in the spinal vertebrae.
Origin
C16: from mod. L., from Gk sunkhondrōsis , from sun- 'together' + khondros 'cartilage'.