Definition of "synostosis"

synostosis

noun
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.
  Quotations
  Conditions such as those are known collectively as single suture synostosis.
  2009 January 25, Denis Campbell, “Kian, 4, needs a miracle. He's in the right place”, in The Observer‎