synostosis

From syn- + Ancient Greek ὀστέον (ostéon, “bone”) + -osis.

synostosis (countable and uncountable, plural synostoses)

1. (physiology) The fusion of adjacent bones by the growth of a bony material
2. (pathology) The abnormal development of a joint.
   • 2009 January 25, Denis Campbell, “Kian, 4, needs a miracle. He's in the right place”, in The Observer‎:

     Conditions such as those are known collectively as single suture synostosis.

• dysostosis

• craniosynostosis
• radio-ulnar synostosis
• syndactyly